__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

This gives numeric names to tuple fields, because lldb clients expect
fields to have names, and because using plain numbers seemed most
rust-like.

Closes rust-lang#21

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

When `Target::GetEntryPointAddress()` calls `exe_module->GetObjectFile()->GetEntryPointAddress()`, and the returned
`entry_addr` is valid, it can immediately be returned.

However, just before that, an `llvm::Error` value has been setup, but in this case it is not consumed before returning, like is done further below in the function.

In https://bugs.freebsd.org/248745 we got a bug report for this, where a very simple test case aborts and dumps core:

```
* thread #1, name = 'testcase', stop reason = breakpoint 1.1
    frame #0: 0x00000000002018d4 testcase`main(argc=1, argv=0x00007fffffffea18) at testcase.c:3:5
   1	int main(int argc, char *argv[])
   2	{
-> 3	    return 0;
   4	}
(lldb) p argc
Program aborted due to an unhandled Error:
Error value was Success. (Note: Success values must still be checked prior to being destroyed).

Thread 1 received signal SIGABRT, Aborted.
thr_kill () at thr_kill.S:3
3	thr_kill.S: No such file or directory.
(gdb) bt
#0  thr_kill () at thr_kill.S:3
#1  0x00000008049a0004 in __raise (s=6) at /usr/src/lib/libc/gen/raise.c:52
rust-lang#2  0x0000000804916229 in abort () at /usr/src/lib/libc/stdlib/abort.c:67
rust-lang#3  0x000000000451b5f5 in fatalUncheckedError () at /usr/src/contrib/llvm-project/llvm/lib/Support/Error.cpp:112
rust-lang#4  0x00000000019cf008 in GetEntryPointAddress () at /usr/src/contrib/llvm-project/llvm/include/llvm/Support/Error.h:267
rust-lang#5  0x0000000001bccbd8 in ConstructorSetup () at /usr/src/contrib/llvm-project/lldb/source/Target/ThreadPlanCallFunction.cpp:67
rust-lang#6  0x0000000001bcd2c0 in ThreadPlanCallFunction () at /usr/src/contrib/llvm-project/lldb/source/Target/ThreadPlanCallFunction.cpp:114
rust-lang#7  0x00000000020076d4 in InferiorCallMmap () at /usr/src/contrib/llvm-project/lldb/source/Plugins/Process/Utility/InferiorCallPOSIX.cpp:97
rust-lang#8  0x0000000001f4be33 in DoAllocateMemory () at /usr/src/contrib/llvm-project/lldb/source/Plugins/Process/FreeBSD/ProcessFreeBSD.cpp:604
rust-lang#9  0x0000000001fe51b9 in AllocatePage () at /usr/src/contrib/llvm-project/lldb/source/Target/Memory.cpp:347
rust-lang#10 0x0000000001fe5385 in AllocateMemory () at /usr/src/contrib/llvm-project/lldb/source/Target/Memory.cpp:383
rust-lang#11 0x0000000001974da2 in AllocateMemory () at /usr/src/contrib/llvm-project/lldb/source/Target/Process.cpp:2301
rust-lang#12 CanJIT () at /usr/src/contrib/llvm-project/lldb/source/Target/Process.cpp:2331
rust-lang#13 0x0000000001a1bf3d in Evaluate () at /usr/src/contrib/llvm-project/lldb/source/Expression/UserExpression.cpp:190
rust-lang#14 0x00000000019ce7a2 in EvaluateExpression () at /usr/src/contrib/llvm-project/lldb/source/Target/Target.cpp:2372
rust-lang#15 0x0000000001ad784c in EvaluateExpression () at /usr/src/contrib/llvm-project/lldb/source/Commands/CommandObjectExpression.cpp:414
rust-lang#16 0x0000000001ad86ae in DoExecute () at /usr/src/contrib/llvm-project/lldb/source/Commands/CommandObjectExpression.cpp:646
rust-lang#17 0x0000000001a5e3ed in Execute () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandObject.cpp:1003
rust-lang#18 0x0000000001a6c4a3 in HandleCommand () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:1762
rust-lang#19 0x0000000001a6f98c in IOHandlerInputComplete () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:2760
rust-lang#20 0x0000000001a90b08 in Run () at /usr/src/contrib/llvm-project/lldb/source/Core/IOHandler.cpp:548
rust-lang#21 0x00000000019a6c6a in ExecuteIOHandlers () at /usr/src/contrib/llvm-project/lldb/source/Core/Debugger.cpp:903
rust-lang#22 0x0000000001a70337 in RunCommandInterpreter () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:2946
rust-lang#23 0x0000000001d9d812 in RunCommandInterpreter () at /usr/src/contrib/llvm-project/lldb/source/API/SBDebugger.cpp:1169
rust-lang#24 0x0000000001918be8 in MainLoop () at /usr/src/contrib/llvm-project/lldb/tools/driver/Driver.cpp:675
rust-lang#25 0x000000000191a114 in main () at /usr/src/contrib/llvm-project/lldb/tools/driver/Driver.cpp:890```

Fix the incorrect error catch by only instantiating an `Error` object if it is necessary.

Reviewed By: JDevlieghere

Differential Revision: https://reviews.llvm.org/D86355

When `Target::GetEntryPointAddress()` calls `exe_module->GetObjectFile()->GetEntryPointAddress()`, and the returned
`entry_addr` is valid, it can immediately be returned.

However, just before that, an `llvm::Error` value has been setup, but in this case it is not consumed before returning, like is done further below in the function.

In https://bugs.freebsd.org/248745 we got a bug report for this, where a very simple test case aborts and dumps core:

```
* thread #1, name = 'testcase', stop reason = breakpoint 1.1
    frame #0: 0x00000000002018d4 testcase`main(argc=1, argv=0x00007fffffffea18) at testcase.c:3:5
   1	int main(int argc, char *argv[])
   2	{
-> 3	    return 0;
   4	}
(lldb) p argc
Program aborted due to an unhandled Error:
Error value was Success. (Note: Success values must still be checked prior to being destroyed).

Thread 1 received signal SIGABRT, Aborted.
thr_kill () at thr_kill.S:3
3	thr_kill.S: No such file or directory.
(gdb) bt
#0  thr_kill () at thr_kill.S:3
#1  0x00000008049a0004 in __raise (s=6) at /usr/src/lib/libc/gen/raise.c:52
#2  0x0000000804916229 in abort () at /usr/src/lib/libc/stdlib/abort.c:67
#3  0x000000000451b5f5 in fatalUncheckedError () at /usr/src/contrib/llvm-project/llvm/lib/Support/Error.cpp:112
#4  0x00000000019cf008 in GetEntryPointAddress () at /usr/src/contrib/llvm-project/llvm/include/llvm/Support/Error.h:267
#5  0x0000000001bccbd8 in ConstructorSetup () at /usr/src/contrib/llvm-project/lldb/source/Target/ThreadPlanCallFunction.cpp:67
#6  0x0000000001bcd2c0 in ThreadPlanCallFunction () at /usr/src/contrib/llvm-project/lldb/source/Target/ThreadPlanCallFunction.cpp:114
#7  0x00000000020076d4 in InferiorCallMmap () at /usr/src/contrib/llvm-project/lldb/source/Plugins/Process/Utility/InferiorCallPOSIX.cpp:97
#8  0x0000000001f4be33 in DoAllocateMemory () at /usr/src/contrib/llvm-project/lldb/source/Plugins/Process/FreeBSD/ProcessFreeBSD.cpp:604
#9  0x0000000001fe51b9 in AllocatePage () at /usr/src/contrib/llvm-project/lldb/source/Target/Memory.cpp:347
#10 0x0000000001fe5385 in AllocateMemory () at /usr/src/contrib/llvm-project/lldb/source/Target/Memory.cpp:383
#11 0x0000000001974da2 in AllocateMemory () at /usr/src/contrib/llvm-project/lldb/source/Target/Process.cpp:2301
#12 CanJIT () at /usr/src/contrib/llvm-project/lldb/source/Target/Process.cpp:2331
#13 0x0000000001a1bf3d in Evaluate () at /usr/src/contrib/llvm-project/lldb/source/Expression/UserExpression.cpp:190
#14 0x00000000019ce7a2 in EvaluateExpression () at /usr/src/contrib/llvm-project/lldb/source/Target/Target.cpp:2372
#15 0x0000000001ad784c in EvaluateExpression () at /usr/src/contrib/llvm-project/lldb/source/Commands/CommandObjectExpression.cpp:414
#16 0x0000000001ad86ae in DoExecute () at /usr/src/contrib/llvm-project/lldb/source/Commands/CommandObjectExpression.cpp:646
#17 0x0000000001a5e3ed in Execute () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandObject.cpp:1003
#18 0x0000000001a6c4a3 in HandleCommand () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:1762
#19 0x0000000001a6f98c in IOHandlerInputComplete () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:2760
#20 0x0000000001a90b08 in Run () at /usr/src/contrib/llvm-project/lldb/source/Core/IOHandler.cpp:548
#21 0x00000000019a6c6a in ExecuteIOHandlers () at /usr/src/contrib/llvm-project/lldb/source/Core/Debugger.cpp:903
#22 0x0000000001a70337 in RunCommandInterpreter () at /usr/src/contrib/llvm-project/lldb/source/Interpreter/CommandInterpreter.cpp:2946
#23 0x0000000001d9d812 in RunCommandInterpreter () at /usr/src/contrib/llvm-project/lldb/source/API/SBDebugger.cpp:1169
#24 0x0000000001918be8 in MainLoop () at /usr/src/contrib/llvm-project/lldb/tools/driver/Driver.cpp:675
#25 0x000000000191a114 in main () at /usr/src/contrib/llvm-project/lldb/tools/driver/Driver.cpp:890```

Fix the incorrect error catch by only instantiating an `Error` object if it is necessary.

Reviewed By: JDevlieghere

Differential Revision: https://reviews.llvm.org/D86355

(cherry picked from commit 1ce07cd)

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

CXXDeductionGuideDecl with a local typedef has its own copy of the
TypedefDecl with the CXXDeductionGuideDecl as the DeclContext of that
TypedefDecl.
```
      template <typename T> struct A {
        typedef T U;
        A(U, T);
      };
      A a{(int)0, (int)0};
```
Related discussion on cfe-dev:
http://lists.llvm.org/pipermail/cfe-dev/2020-November/067252.html

Without this fix, when we import the CXXDeductionGuideDecl (via
VisitFunctionDecl) then before creating the Decl we must import the
FunctionType. However, the first parameter's type is the afore mentioned
local typedef. So, we then start importing the TypedefDecl whose
DeclContext is the CXXDeductionGuideDecl itself. The infinite loop is
formed.
```
 #0 clang::ASTNodeImporter::VisitCXXDeductionGuideDecl(clang::CXXDeductionGuideDecl*) clang/lib/AST/ASTImporter.cpp:3543:0
 #1 clang::declvisitor::Base<std::add_pointer, clang::ASTNodeImporter, llvm::Expected<clang::Decl*> >::Visit(clang::Decl*) /home/egbomrt/WORK/llvm5/build/debug/tools/clang/include/clang/AST/DeclNodes.inc:405:0
 rust-lang#2 clang::ASTImporter::ImportImpl(clang::Decl*) clang/lib/AST/ASTImporter.cpp:8038:0
 rust-lang#3 clang::ASTImporter::Import(clang::Decl*) clang/lib/AST/ASTImporter.cpp:8200:0
 rust-lang#4 clang::ASTImporter::ImportContext(clang::DeclContext*) clang/lib/AST/ASTImporter.cpp:8297:0
 rust-lang#5 clang::ASTNodeImporter::ImportDeclContext(clang::Decl*, clang::DeclContext*&, clang::DeclContext*&) clang/lib/AST/ASTImporter.cpp:1852:0
 rust-lang#6 clang::ASTNodeImporter::ImportDeclParts(clang::NamedDecl*, clang::DeclContext*&, clang::DeclContext*&, clang::DeclarationName&, clang::NamedDecl*&, clang::SourceLocation&) clang/lib/AST/ASTImporter.cpp:1628:0
 rust-lang#7 clang::ASTNodeImporter::VisitTypedefNameDecl(clang::TypedefNameDecl*, bool) clang/lib/AST/ASTImporter.cpp:2419:0
 rust-lang#8 clang::ASTNodeImporter::VisitTypedefDecl(clang::TypedefDecl*) clang/lib/AST/ASTImporter.cpp:2500:0
 rust-lang#9 clang::declvisitor::Base<std::add_pointer, clang::ASTNodeImporter, llvm::Expected<clang::Decl*> >::Visit(clang::Decl*) /home/egbomrt/WORK/llvm5/build/debug/tools/clang/include/clang/AST/DeclNodes.inc:315:0
 rust-lang#10 clang::ASTImporter::ImportImpl(clang::Decl*) clang/lib/AST/ASTImporter.cpp:8038:0
 rust-lang#11 clang::ASTImporter::Import(clang::Decl*) clang/lib/AST/ASTImporter.cpp:8200:0
 rust-lang#12 llvm::Expected<clang::TypedefNameDecl*> clang::ASTNodeImporter::import<clang::TypedefNameDecl>(clang::TypedefNameDecl*) clang/lib/AST/ASTImporter.cpp:165:0
 rust-lang#13 clang::ASTNodeImporter::VisitTypedefType(clang::TypedefType const*) clang/lib/AST/ASTImporter.cpp:1304:0
 rust-lang#14 clang::TypeVisitor<clang::ASTNodeImporter, llvm::Expected<clang::QualType> >::Visit(clang::Type const*) /home/egbomrt/WORK/llvm5/build/debug/tools/clang/include/clang/AST/TypeNodes.inc:74:0
 rust-lang#15 clang::ASTImporter::Import(clang::QualType) clang/lib/AST/ASTImporter.cpp:8071:0
 rust-lang#16 llvm::Expected<clang::QualType> clang::ASTNodeImporter::import<clang::QualType>(clang::QualType const&) clang/lib/AST/ASTImporter.cpp:179:0
 rust-lang#17 clang::ASTNodeImporter::VisitFunctionProtoType(clang::FunctionProtoType const*) clang/lib/AST/ASTImporter.cpp:1244:0
 rust-lang#18 clang::TypeVisitor<clang::ASTNodeImporter, llvm::Expected<clang::QualType> >::Visit(clang::Type const*) /home/egbomrt/WORK/llvm5/build/debug/tools/clang/include/clang/AST/TypeNodes.inc:47:0
 rust-lang#19 clang::ASTImporter::Import(clang::QualType) clang/lib/AST/ASTImporter.cpp:8071:0
 rust-lang#20 llvm::Expected<clang::QualType> clang::ASTNodeImporter::import<clang::QualType>(clang::QualType const&) clang/lib/AST/ASTImporter.cpp:179:0
 rust-lang#21 clang::QualType clang::ASTNodeImporter::importChecked<clang::QualType>(llvm::Error&, clang::QualType const&) clang/lib/AST/ASTImporter.cpp:198:0
 rust-lang#22 clang::ASTNodeImporter::VisitFunctionDecl(clang::FunctionDecl*) clang/lib/AST/ASTImporter.cpp:3313:0
 rust-lang#23 clang::ASTNodeImporter::VisitCXXDeductionGuideDecl(clang::CXXDeductionGuideDecl*) clang/lib/AST/ASTImporter.cpp:3543:0
```

The fix is to first create the TypedefDecl and only then start to import
the DeclContext.
Basically, we could do this during the import of all other Decls (not
just for typedefs). But it seems, there is only one another AST
construct that has a similar cycle: a struct defined as a function
parameter:
```
int struct_in_proto(struct data_t{int a;int b;} *d);

```
In that case, however, we had decided to return simply with an error
back then because that seemed to be a very rare construct.

Differential Revision: https://reviews.llvm.org/D92209

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

There is a SIGSEGV at `DeduceTemplateArgumentsByTypeMatch`. The bug [llvm#51171](https://bugs.llvm.org/show_bug.cgi?id=51171) was filled. The reproducer can be found at the bug description.

LIT test for the issue was added:
```
./bin/llvm-lit -v ../clang/test/SemaCXX/pr51171-crash.cpp
```

The debug stack trace is below:
```
 #0 0x00000000055afcb9 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /home/ivanmurashko/local/llvm-project/llvm/lib/Support/Unix/Signals.inc:565:22
 #1 0x00000000055afd70 PrintStackTraceSignalHandler(void*) /home/ivanmurashko/local/llvm-project/llvm/lib/Support/Unix/Signals.inc:632:1
 rust-lang#2 0x00000000055add2d llvm::sys::RunSignalHandlers() /home/ivanmurashko/local/llvm-project/llvm/lib/Support/Signals.cpp:97:20
 rust-lang#3 0x00000000055af701 SignalHandler(int) /home/ivanmurashko/local/llvm-project/llvm/lib/Support/Unix/Signals.inc:407:1
 rust-lang#4 0x00007ffff7bc2b20 __restore_rt sigaction.c:0:0
 rust-lang#5 0x00007ffff66a337f raise (/lib64/libc.so.6+0x3737f)
 rust-lang#6 0x00007ffff668ddb5 abort (/lib64/libc.so.6+0x21db5)
 rust-lang#7 0x00007ffff668dc89 _nl_load_domain.cold.0 loadmsgcat.c:0:0
 rust-lang#8 0x00007ffff669ba76 .annobin___GI___assert_fail.end assert.c:0:0
 rust-lang#9 0x000000000594b210 clang::QualType::getCommonPtr() const /home/ivanmurashko/local/llvm-project/clang/include/clang/AST/Type.h:684:5
rust-lang#10 0x0000000005a12ca6 clang::QualType::getCanonicalType() const /home/ivanmurashko/local/llvm-project/clang/include/clang/AST/Type.h:6467:36
rust-lang#11 0x0000000005a137a6 clang::ASTContext::getCanonicalType(clang::QualType) const /home/ivanmurashko/local/llvm-project/clang/include/clang/AST/ASTContext.h:2433:58
rust-lang#12 0x0000000009204584 DeduceTemplateArgumentsByTypeMatch(clang::Sema&, clang::TemplateParameterList*, clang::QualType, clang::QualType, clang::sema::TemplateDeductionInfo&, llvm::SmallVectorImpl<clang::DeducedTemplateArgument>&, unsigned int, bool, bool) /home/ivanmurashko/local/llvm-project/clang/lib/Sema/SemaTemplateDeduction.cpp:1355:54
rust-lang#13 0x000000000920df0d clang::Sema::DeduceTemplateArguments(clang::FunctionTemplateDecl*, clang::TemplateArgumentListInfo*, clang::QualType, clang::FunctionDecl*&, clang::sema::TemplateDeductionInfo&, bool) /home/ivanmurashko/local/llvm-project/clang/lib/Sema/SemaTemplateDeduction.cpp:4354:47
rust-lang#14 0x0000000009012b09 (anonymous namespace)::AddressOfFunctionResolver::AddMatchingTemplateFunction(clang::FunctionTemplateDecl*, clang::DeclAccessPair const&) /home/ivanmurashko/local/llvm-project/clang/lib/Sema/SemaOverload.cpp:12026:38
rust-lang#15 0x0000000009013030 (anonymous namespace)::AddressOfFunctionResolver::FindAllFunctionsThatMatchTargetTypeExactly() /home/ivanmurashko/local/llvm-project/clang/lib/Sema/SemaOverload.cpp:12119:9
rust-lang#16 0x0000000009012679 (anonymous namespace)::AddressOfFunctionResolver::AddressOfFunctionResolver(clang::Sema&, clang::Expr*, clang::QualType const&, bool) /home/ivanmurashko/local/llvm-project/clang/lib/Sema/SemaOverload.cpp:11931:5
rust-lang#17 0x0000000009013c91 clang::Sema::ResolveAddressOfOverloadedFunction(clang::Expr*, clang::QualType, bool, clang::DeclAccessPair&, bool*) /home/ivanmurashko/local/llvm-project/clang/lib/Sema/SemaOverload.cpp:12286:42
rust-lang#18 0x0000000008fed85d IsStandardConversion(clang::Sema&, clang::Expr*, clang::QualType, bool, clang::StandardConversionSequence&, bool, bool) /home/ivanmurashko/local/llvm-project/clang/lib/Sema/SemaOverload.cpp:1712:49
rust-lang#19 0x0000000008fec8ea TryImplicitConversion(clang::Sema&, clang::Expr*, clang::QualType, bool, clang::Sema::AllowedExplicit, bool, bool, bool, bool) /home/ivanmurashko/local/llvm-project/clang/lib/Sema/SemaOverload.cpp:1433:27
rust-lang#20 0x0000000008ff90ba TryCopyInitialization(clang::Sema&, clang::Expr*, clang::QualType, bool, bool, bool, bool) /home/ivanmurashko/local/llvm-project/clang/lib/Sema/SemaOverload.cpp:5273:71
rust-lang#21 0x00000000090024fb clang::Sema::AddBuiltinCandidate(clang::QualType*, llvm::ArrayRef<clang::Expr*>, clang::OverloadCandidateSet&, bool, unsigned int) /home/ivanmurashko/local/llvm-project/clang/lib/Sema/SemaOverload.cpp:7755:32
rust-lang#22 0x000000000900513f (anonymous namespace)::BuiltinOperatorOverloadBuilder::addGenericBinaryArithmeticOverloads() /home/ivanmurashko/local/llvm-project/clang/lib/Sema/SemaOverload.cpp:8633:30
rust-lang#23 0x0000000009007624 clang::Sema::AddBuiltinOperatorCandidates(clang::OverloadedOperatorKind, clang::SourceLocation, llvm::ArrayRef<clang::Expr*>, clang::OverloadCandidateSet&) /home/ivanmurashko/local/llvm-project/clang/lib/Sema/SemaOverload.cpp:9205:51
rust-lang#24 0x0000000009018734 clang::Sema::LookupOverloadedBinOp(clang::OverloadCandidateSet&, clang::OverloadedOperatorKind, clang::UnresolvedSetImpl const&, llvm::ArrayRef<clang::Expr*>, bool) /home/ivanmurashko/local/llvm-project/clang/lib/Sema/SemaOverload.cpp:13469:1
rust-lang#25 0x0000000009018d56 clang::Sema::CreateOverloadedBinOp(clang::SourceLocation, clang::BinaryOperatorKind, clang::UnresolvedSetImpl const&, clang::Expr*, clang::Expr*, bool, bool, clang::FunctionDecl*) /home/ivanmurashko/local/llvm-project/clang/lib/Sema/SemaOverload.cpp:13568:24
rust-lang#26 0x0000000008b24797 BuildOverloadedBinOp(clang::Sema&, clang::Scope*, clang::SourceLocation, clang::BinaryOperatorKind, clang::Expr*, clang::Expr*) /home/ivanmurashko/local/llvm-project/clang/lib/Sema/SemaExpr.cpp:14606:65
rust-lang#27 0x0000000008b24ed5 clang::Sema::BuildBinOp(clang::Scope*, clang::SourceLocation, clang::BinaryOperatorKind, clang::Expr*, clang::Expr*) /home/ivanmurashko/local/llvm-project/clang/lib/Sema/SemaExpr.cpp:14691:73
rust-lang#28 0x0000000008b245d4 clang::Sema::ActOnBinOp(clang::Scope*, clang::SourceLocation, clang::tok::TokenKind, clang::Expr*, clang::Expr*) /home/ivanmurashko/local/llvm-project/clang/lib/Sema/SemaExpr.cpp:14566:1
rust-lang#29 0x00000000085bfafb clang::Parser::ParseRHSOfBinaryExpression(clang::ActionResult<clang::Expr*, true>, clang::prec::Level) /home/ivanmurashko/local/llvm-project/clang/lib/Parse/ParseExpr.cpp:630:71
rust-lang#30 0x00000000085bd922 clang::Parser::ParseAssignmentExpression(clang::Parser::TypeCastState) /home/ivanmurashko/local/llvm-project/clang/lib/Parse/ParseExpr.cpp:177:1
rust-lang#31 0x00000000085cbbcd clang::Parser::ParseExpressionList(llvm::SmallVectorImpl<clang::Expr*>&, llvm::SmallVectorImpl<clang::SourceLocation>&, llvm::function_ref<void ()>) /home/ivanmurashko/local/llvm-project/clang/lib/Parse/ParseExpr.cpp:3368:40
rust-lang#32 0x000000000857f49c clang::Parser::ParseDeclarationAfterDeclaratorAndAttributes(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&, clang::Parser::ForRangeInit*) /home/ivanmurashko/local/llvm-project/clang/lib/Parse/ParseDecl.cpp:2416:5
rust-lang#33 0x000000000857df16 clang::Parser::ParseDeclGroup(clang::ParsingDeclSpec&, clang::DeclaratorContext, clang::SourceLocation*, clang::Parser::ForRangeInit*) /home/ivanmurashko/local/llvm-project/clang/lib/Parse/ParseDecl.cpp:2092:65
rust-lang#34 0x000000000855f07b clang::Parser::ParseDeclOrFunctionDefInternal(clang::ParsedAttributesWithRange&, clang::ParsingDeclSpec&, clang::AccessSpecifier) /home/ivanmurashko/local/llvm-project/clang/lib/Parse/Parser.cpp:1138:1
rust-lang#35 0x000000000855f136 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::ParsedAttributesWithRange&, clang::ParsingDeclSpec*, clang::AccessSpecifier) /home/ivanmurashko/local/llvm-project/clang/lib/Parse/Parser.cpp:1153:57
rust-lang#36 0x000000000855e644 clang::Parser::ParseExternalDeclaration(clang::ParsedAttributesWithRange&, clang::ParsingDeclSpec*) /home/ivanmurashko/local/llvm-project/clang/lib/Parse/Parser.cpp:975:58
rust-lang#37 0x000000000855d717 clang::Parser::ParseTopLevelDecl(clang::OpaquePtr<clang::DeclGroupRef>&, bool) /home/ivanmurashko/local/llvm-project/clang/lib/Parse/Parser.cpp:720:42
rust-lang#38 0x0000000008558e01 clang::ParseAST(clang::Sema&, bool, bool) /home/ivanmurashko/local/llvm-project/clang/lib/Parse/ParseAST.cpp:158:37
rust-lang#39 0x000000000627a221 clang::ASTFrontendAction::ExecuteAction() /home/ivanmurashko/local/llvm-project/clang/lib/Frontend/FrontendAction.cpp:1058:11
rust-lang#40 0x0000000006bdcc31 clang::CodeGenAction::ExecuteAction() /home/ivanmurashko/local/llvm-project/clang/lib/CodeGen/CodeGenAction.cpp:1045:5
rust-lang#41 0x0000000006279b4d clang::FrontendAction::Execute() /home/ivanmurashko/local/llvm-project/clang/lib/Frontend/FrontendAction.cpp:955:38
rust-lang#42 0x00000000061c3fe9 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) /home/ivanmurashko/local/llvm-project/clang/lib/Frontend/CompilerInstance.cpp:974:42
rust-lang#43 0x00000000063f9c5e clang::ExecuteCompilerInvocation(clang::CompilerInstance*) /home/ivanmurashko/local/llvm-project/clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:278:38
rust-lang#44 0x0000000002603a03 cc1_main(llvm::ArrayRef<char const*>, char const*, void*) /home/ivanmurashko/local/llvm-project/clang/tools/driver/cc1_main.cpp:246:40
rust-lang#45 0x00000000025f8a39 ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) /home/ivanmurashko/local/llvm-project/clang/tools/driver/driver.cpp:338:20
rust-lang#46 0x00000000025f9107 main /home/ivanmurashko/local/llvm-project/clang/tools/driver/driver.cpp:415:26
rust-lang#47 0x00007ffff668f493 __libc_start_main (/lib64/libc.so.6+0x23493)
rust-lang#48 0x00000000025f729e _start (/data/users/ivanmurashko/llvm-project/build/bin/clang-13+0x25f729e)
```

Reviewed By: erichkeane

Differential Revision: https://reviews.llvm.org/D106583

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

Found by msan -fsanitize-memory-use-after-dtor.

==8259==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x55dbec54d2b8 in dtorRecord(clang::interp::Block*, char*, clang::interp::Descriptor*) clang/lib/AST/Interp/Descriptor.cpp:150:22
    #1 0x55dbec54bfcf in dtorArrayDesc(clang::interp::Block*, char*, clang::interp::Descriptor*) clang/lib/AST/Interp/Descriptor.cpp:97:7
    rust-lang#2 0x55dbec508578 in invokeDtor clang/lib/AST/Interp/InterpBlock.h:79:7
    rust-lang#3 0x55dbec508578 in clang::interp::Program::~Program() clang/lib/AST/Interp/Program.h:55:19
    rust-lang#4 0x55dbec50657a in operator() third_party/crosstool/v18/stable/toolchain/bin/../include/c++/v1/__memory/unique_ptr.h:55:5
    rust-lang#5 0x55dbec50657a in std::__msan::unique_ptr<clang::interp::Program, std::__msan::default_delete<clang::interp::Program>>::~unique_ptr() third_party/crosstool/v18/stable/toolchain/bin/../include/c++/v1/__memory/unique_ptr.h:261:7
    rust-lang#6 0x55dbec5035a1 in clang::interp::Context::~Context() clang/lib/AST/Interp/Context.cpp:27:22
    rust-lang#7 0x55dbebec1daa in operator() third_party/crosstool/v18/stable/toolchain/bin/../include/c++/v1/__memory/unique_ptr.h:55:5
    rust-lang#8 0x55dbebec1daa in std::__msan::unique_ptr<clang::interp::Context, std::__msan::default_delete<clang::interp::Context>>::~unique_ptr() third_party/crosstool/v18/stable/toolchain/bin/../include/c++/v1/__memory/unique_ptr.h:261:7
    rust-lang#9 0x55dbebe285f9 in clang::ASTContext::~ASTContext() clang/lib/AST/ASTContext.cpp:1038:40
    rust-lang#10 0x55dbe941ff13 in llvm::RefCountedBase<clang::ASTContext>::Release() const llvm/include/llvm/ADT/IntrusiveRefCntPtr.h:101:7
    rust-lang#11 0x55dbe94353ef in release llvm/include/llvm/ADT/IntrusiveRefCntPtr.h:159:38
    rust-lang#12 0x55dbe94353ef in release llvm/include/llvm/ADT/IntrusiveRefCntPtr.h:224:7
    rust-lang#13 0x55dbe94353ef in ~IntrusiveRefCntPtr llvm/include/llvm/ADT/IntrusiveRefCntPtr.h:191:27
    rust-lang#14 0x55dbe94353ef in clang::CompilerInstance::setASTContext(clang::ASTContext*) clang/lib/Frontend/CompilerInstance.cpp:178:3
    rust-lang#15 0x55dbe95ad0ad in clang::FrontendAction::EndSourceFile() clang/lib/Frontend/FrontendAction.cpp:1100:8
    rust-lang#16 0x55dbe9445fcf in clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) clang/lib/Frontend/CompilerInstance.cpp:1047:11
    rust-lang#17 0x55dbe6b3afef in clang::ExecuteCompilerInvocation(clang::CompilerInstance*) clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:266:25
    rust-lang#18 0x55dbe6b13288 in cc1_main(llvm::ArrayRef<char const*>, char const*, void*) clang/tools/driver/cc1_main.cpp:250:15
    rust-lang#19 0x55dbe6b0095f in ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) clang/tools/driver/driver.cpp:319:12
    rust-lang#20 0x55dbe6aff41c in clang_main(int, char**) clang/tools/driver/driver.cpp:395:12
    rust-lang#21 0x7f9be07fa632 in __libc_start_main
    rust-lang#22 0x55dbe6a702e9 in _start

  Member fields were destroyed
    #0 0x55dbe6a7da5d in __sanitizer_dtor_callback_fields compiler-rt/lib/msan/msan_interceptors.cpp:949:5
    #1 0x55dbec5094ac in ~SmallVectorImpl llvm/include/llvm/ADT/SmallVector.h:479:7
    rust-lang#2 0x55dbec5094ac in ~SmallVectorImpl llvm/include/llvm/ADT/SmallVector.h:612:3
    rust-lang#3 0x55dbec5094ac in llvm::SmallVector<clang::interp::Record::Base, 8u>::~SmallVector() llvm/include/llvm/ADT/SmallVector.h:1207:3
    rust-lang#4 0x55dbec508e79 in clang::interp::Record::~Record() clang/lib/AST/Interp/Record.h:24:7
    rust-lang#5 0x55dbec508612 in clang::interp::Program::~Program() clang/lib/AST/Interp/Program.h:49:26
    rust-lang#6 0x55dbec50657a in operator() third_party/crosstool/v18/stable/toolchain/bin/../include/c++/v1/__memory/unique_ptr.h:55:5
    rust-lang#7 0x55dbec50657a in std::__msan::unique_ptr<clang::interp::Program, std::__msan::default_delete<clang::interp::Program>>::~unique_ptr() third_party/crosstool/v18/stable/toolchain/bin/../include/c++/v1/__memory/unique_ptr.h:261:7
    rust-lang#8 0x55dbec5035a1 in clang::interp::Context::~Context() clang/lib/AST/Interp/Context.cpp:27:22
    rust-lang#9 0x55dbebec1daa in operator() third_party/crosstool/v18/stable/toolchain/bin/../include/c++/v1/__memory/unique_ptr.h:55:5
    rust-lang#10 0x55dbebec1daa in std::__msan::unique_ptr<clang::interp::Context, std::__msan::default_delete<clang::interp::Context>>::~unique_ptr() third_party/crosstool/v18/stable/toolchain/bin/../include/c++/v1/__memory/unique_ptr.h:261:7
    rust-lang#11 0x55dbebe285f9 in clang::ASTContext::~ASTContext() clang/lib/AST/ASTContext.cpp:1038:40
    rust-lang#12 0x55dbe941ff13 in llvm::RefCountedBase<clang::ASTContext>::Release() const llvm/include/llvm/ADT/IntrusiveRefCntPtr.h:101:7
    rust-lang#13 0x55dbe94353ef in release llvm/include/llvm/ADT/IntrusiveRefCntPtr.h:159:38
    rust-lang#14 0x55dbe94353ef in release llvm/include/llvm/ADT/IntrusiveRefCntPtr.h:224:7
    rust-lang#15 0x55dbe94353ef in ~IntrusiveRefCntPtr llvm/include/llvm/ADT/IntrusiveRefCntPtr.h:191:27
    rust-lang#16 0x55dbe94353ef in clang::CompilerInstance::setASTContext(clang::ASTContext*) clang/lib/Frontend/CompilerInstance.cpp:178:3
    rust-lang#17 0x55dbe95ad0ad in clang::FrontendAction::EndSourceFile() clang/lib/Frontend/FrontendAction.cpp:1100:8
    rust-lang#18 0x55dbe9445fcf in clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) clang/lib/Frontend/CompilerInstance.cpp:1047:11
    rust-lang#19 0x55dbe6b3afef in clang::ExecuteCompilerInvocation(clang::CompilerInstance*) clang/lib/FrontendTool/ExecuteCompilerInvocation.cpp:266:25
    rust-lang#20 0x55dbe6b13288 in cc1_main(llvm::ArrayRef<char const*>, char const*, void*) clang/tools/driver/cc1_main.cpp:250:15
    rust-lang#21 0x55dbe6b0095f in ExecuteCC1Tool(llvm::SmallVectorImpl<char const*>&) clang/tools/driver/driver.cpp:319:12
    rust-lang#22 0x55dbe6aff41c in clang_main(int, char**) clang/tools/driver/driver.cpp:395:12
    rust-lang#23 0x7f9be07fa632 in __libc_start_main
    rust-lang#24 0x55dbe6a702e9 in _start

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

…D112621

It seems like `LHS` and `RHS` could be empty range sets.
This caused an assertion failure inside RangeConstraintManager.

I'm hoisting out the check from the function into the call-site.
This way we could assert that we only want to deal with non-empty range
sets.

The relevant part of the trace:
```
 rust-lang#6 0x00007fe6ff5f81a6 __assert_fail_base (/lib64/libc.so.6+0x2f1a6)
 rust-lang#7 0x00007fe6ff5f8252 (/lib64/libc.so.6+0x2f252)
 rust-lang#8 0x00000000049caed2 (anonymous namespace)::SymbolicRangeInferrer::VisitBinaryOperator(clang::ento::RangeSet, clang::BinaryOperatorKind, clang::ento::RangeSet, clang::QualType) RangeConstraintManager.cpp:0:0
 rust-lang#9 0x00000000049c9867 (anonymous namespace)::SymbolicRangeInferrer::infer(clang::ento::SymExpr const*) RangeConstraintManager.cpp:0:0
rust-lang#10 0x00000000049bebf5 (anonymous namespace)::RangeConstraintManager::assumeSymNE(llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>, clang::ento::SymExpr const*, llvm::APSInt const&, llvm::APSInt const&) RangeConstraintManager.cpp:0:0
rust-lang#11 0x00000000049d368c clang::ento::RangedConstraintManager::assumeSymUnsupported(llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>, clang::ento::SymExpr const*, bool) (../../main-github/llvm/build-all/bin/clang+0x49d368c)
rust-lang#12 0x00000000049f0b09 clang::ento::SimpleConstraintManager::assumeAux(llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>, clang::ento::NonLoc, bool) (../../main-github/llvm/build-all/bin/clang+0x49f0b09)
rust-lang#13 0x00000000049f096a clang::ento::SimpleConstraintManager::assume(llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>, clang::ento::NonLoc, bool) (../../main-github/llvm/build-all/bin/clang+0x49f096a)
rust-lang#14 0x00000000049f086d clang::ento::SimpleConstraintManager::assumeInternal(llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>, clang::ento::DefinedSVal, bool) (../../main-github/llvm/build-all/bin/clang+0x49f086d)
rust-lang#15 0x000000000492d3e3 clang::ento::ConstraintManager::assumeDual(llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>, clang::ento::DefinedSVal) (../../main-github/llvm/build-all/bin/clang+0x492d3e3)
rust-lang#16 0x0000000004955b6d clang::ento::ExprEngine::evalEagerlyAssumeBinOpBifurcation(clang::ento::ExplodedNodeSet&, clang::ento::ExplodedNodeSet&, clang::Expr const*) (../../main-github/llvm/build-all/bin/clang+0x4955b6d)
rust-lang#17 0x00000000049514b6 clang::ento::ExprEngine::Visit(clang::Stmt const*, clang::ento::ExplodedNode*, clang::ento::ExplodedNodeSet&) (../../main-github/llvm/build-all/bin/clang+0x49514b6)
rust-lang#18 0x000000000494c73e clang::ento::ExprEngine::ProcessStmt(clang::Stmt const*, clang::ento::ExplodedNode*) (../../main-github/llvm/build-all/bin/clang+0x494c73e)
rust-lang#19 0x000000000494c459 clang::ento::ExprEngine::processCFGElement(clang::CFGElement, clang::ento::ExplodedNode*, unsigned int, clang::ento::NodeBuilderContext*) (../../main-github/llvm/build-all/bin/clang+0x494c459)
rust-lang#20 0x000000000492f3d0 clang::ento::CoreEngine::HandlePostStmt(clang::CFGBlock const*, unsigned int, clang::ento::ExplodedNode*) (../../main-github/llvm/build-all/bin/clang+0x492f3d0)
rust-lang#21 0x000000000492e1f6 clang::ento::CoreEngine::ExecuteWorkList(clang::LocationContext const*, unsigned int, llvm::IntrusiveRefCntPtr<clang::ento::ProgramState const>) (../../main-github/llvm/build-all/bin/clang+0x492e1f6)
```

Differential Revision: https://reviews.llvm.org/D112621

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...

…tePluginObject

After llvm#68052 this function changed from returning
a nullptr with `return {};` to returning Expected and hitting `llvm_unreachable` before it could
do so.

I gather that we're never supposed to call this function, but on Windows we actually do call
this function because `interpreter->CreateScriptedProcessInterface()` returns
`ScriptedProcessInterface` not `ScriptedProcessPythonInterface`. Likely because
`target_sp->GetDebugger().GetScriptInterpreter()` also does not return a Python related class.

The previously XFAILed test crashed with:
```
 # .---command stderr------------
 # | PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
 # | Stack dump:
 # | 0.  Program arguments: c:\\users\\tcwg\\david.spickett\\build-llvm\\bin\\lldb-test.exe ir-memory-map C:\\Users\\tcwg\\david.spickett\\build-llvm\\tools\\lldb\\test\\Shell\\Expr\\Output\\TestIRMemoryMapWindows.test.tmp C:\\Users\\tcwg\\david.spickett\\llvm-project\\lldb\\test\\Shell\\Expr/Inputs/ir-memory-map-basic
 # | 1.  HandleCommand(command = "run")
 # | Exception Code: 0xC000001D
 # | #0 0x00007ff696b5f588 lldb_private::ScriptedProcessInterface::CreatePluginObject(class llvm::StringRef, class lldb_private::ExecutionContext &, class std::shared_ptr<class lldb_private::StructuredData::Dictionary>, class lldb_private::StructuredData::Generic *) C:\Users\tcwg\david.spickett\llvm-project\lldb\include\lldb\Interpreter\Interfaces\ScriptedProcessInterface.h:28:0
 # | #1 0x00007ff696b1d808 llvm::Expected<std::shared_ptr<lldb_private::StructuredData::Generic> >::operator bool C:\Users\tcwg\david.spickett\llvm-project\llvm\include\llvm\Support\Error.h:567:0
 # | rust-lang#2 0x00007ff696b1d808 lldb_private::ScriptedProcess::ScriptedProcess(class std::shared_ptr<class lldb_private::Target>, class std::shared_ptr<class lldb_private::Listener>, class lldb_private::ScriptedMetadata const &, class lldb_private::Status &) C:\Users\tcwg\david.spickett\llvm-project\lldb\source\Plugins\Process\scripted\ScriptedProcess.cpp:115:0
 # | rust-lang#3 0x00007ff696b1d124 std::shared_ptr<lldb_private::ScriptedProcess>::shared_ptr C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32124\include\memory:1478:0
 # | rust-lang#4 0x00007ff696b1d124 lldb_private::ScriptedProcess::CreateInstance(class std::shared_ptr<class lldb_private::Target>, class std::shared_ptr<class lldb_private::Listener>, class lldb_private::FileSpec const *, bool) C:\Users\tcwg\david.spickett\llvm-project\lldb\source\Plugins\Process\scripted\ScriptedProcess.cpp:61:0
 # | rust-lang#5 0x00007ff69699c8f4 std::_Ptr_base<lldb_private::Process>::_Move_construct_from C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32124\include\memory:1237:0
 # | rust-lang#6 0x00007ff69699c8f4 std::shared_ptr<lldb_private::Process>::shared_ptr C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32124\include\memory:1534:0
 # | rust-lang#7 0x00007ff69699c8f4 std::shared_ptr<lldb_private::Process>::operator= C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32124\include\memory:1594:0
 # | rust-lang#8 0x00007ff69699c8f4 lldb_private::Process::FindPlugin(class std::shared_ptr<class lldb_private::Target>, class llvm::StringRef, class std::shared_ptr<class lldb_private::Listener>, class lldb_private::FileSpec const *, bool) C:\Users\tcwg\david.spickett\llvm-project\lldb\source\Target\Process.cpp:396:0
 # | rust-lang#9 0x00007ff6969bd708 std::_Ptr_base<lldb_private::Process>::_Move_construct_from C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32124\include\memory:1237:0
 # | rust-lang#10 0x00007ff6969bd708 std::shared_ptr<lldb_private::Process>::shared_ptr C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32124\include\memory:1534:0
 # | rust-lang#11 0x00007ff6969bd708 std::shared_ptr<lldb_private::Process>::operator= C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32124\include\memory:1594:0
 # | rust-lang#12 0x00007ff6969bd708 lldb_private::Target::CreateProcess(class std::shared_ptr<class lldb_private::Listener>, class llvm::StringRef, class lldb_private::FileSpec const *, bool) C:\Users\tcwg\david.spickett\llvm-project\lldb\source\Target\Target.cpp:215:0
 # | rust-lang#13 0x00007ff696b13af0 std::_Ptr_base<lldb_private::Process>::_Ptr_base C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32124\include\memory:1230:0
 # | rust-lang#14 0x00007ff696b13af0 std::shared_ptr<lldb_private::Process>::shared_ptr C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32124\include\memory:1524:0
 # | rust-lang#15 0x00007ff696b13af0 lldb_private::PlatformWindows::DebugProcess(class lldb_private::ProcessLaunchInfo &, class lldb_private::Debugger &, class lldb_private::Target &, class lldb_private::Status &) C:\Users\tcwg\david.spickett\llvm-project\lldb\source\Plugins\Platform\Windows\PlatformWindows.cpp:495:0
 # | rust-lang#16 0x00007ff6969cf590 std::_Ptr_base<lldb_private::Process>::_Move_construct_from C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32124\include\memory:1237:0
 # | rust-lang#17 0x00007ff6969cf590 std::shared_ptr<lldb_private::Process>::shared_ptr C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32124\include\memory:1534:0
 # | rust-lang#18 0x00007ff6969cf590 std::shared_ptr<lldb_private::Process>::operator= C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32124\include\memory:1594:0
 # | rust-lang#19 0x00007ff6969cf590 lldb_private::Target::Launch(class lldb_private::ProcessLaunchInfo &, class lldb_private::Stream *) C:\Users\tcwg\david.spickett\llvm-project\lldb\source\Target\Target.cpp:3274:0
 # | rust-lang#20 0x00007ff696fff82c CommandObjectProcessLaunch::DoExecute(class lldb_private::Args &, class lldb_private::CommandReturnObject &) C:\Users\tcwg\david.spickett\llvm-project\lldb\source\Commands\CommandObjectProcess.cpp:258:0
 # | rust-lang#21 0x00007ff696fab6c0 lldb_private::CommandObjectParsed::Execute(char const *, class lldb_private::CommandReturnObject &) C:\Users\tcwg\david.spickett\llvm-project\lldb\source\Interpreter\CommandObject.cpp:751:0
 # `-----------------------------
 # error: command failed with exit status: 0xc000001d
```

That might be a bug on the Windows side, or an artifact of how our build is setup,
but whatever it is, having `CreatePluginObject` return an error and
the caller check it, fixes the failing test.

The built lldb can run the script command to use Python, but I'm not sure if that means
anything.

__builtin_available() pulls in __isOSVersionAtLeast() from
compiler-rt. Comment it out so we don't have to figure out how
to pull in this symbol...