MonoVM: add back dllmap support for macOS #43204
Description
Description
dllmap support is enabled for iOS (Xamarin.iOS) targets:
Lines 1420 to 1422 in c5b6881
this is needed for macOS (Xamarin.Mac) as well, because we use it for the exact same purpose (redirect calls to objc_msgSend to our own implementations).
Example disassembly that shows that it's disabled (calls to mono_dll_insert asserts) on macOS:
$ otool -vVt -p _mono_dllmap_insert ./microsoft.netcore.app.runtime.ios-x64/5.0.0-rc.2.20475.5/runtimes/ios-x64/native/libmonosgen-2.0.dylib
./microsoft.netcore.app.runtime.ios-x64/5.0.0-rc.2.20475.5/runtimes/ios-x64/native/libmonosgen-2.0.dylib:
(__TEXT,__text) section
_mono_dllmap_insert:
00000000001cdda2 pushq %rbp
00000000001cdda3 movq %rsp, %rbp
00000000001cdda6 popq %rbp
00000000001cdda7 jmp _mono_dllmap_insert_internal
$ otool -vVt -p _mono_dllmap_insert ./microsoft.netcore.app.runtime.mono.osx-x64/5.0.0-rc.2.20475.5/runtimes/osx-x64/native/libcoreclr.dylib
./microsoft.netcore.app.runtime.mono.osx-x64/5.0.0-rc.2.20475.5/runtimes/osx-x64/native/libcoreclr.dylib:
(__TEXT,__text) section
_mono_dllmap_insert:
000000000022d430 pushq %rbp
000000000022d431 movq %rsp, %rbp
000000000022d434 leaq 0x103e97(%rip), %rdi ## literal pool for: "/Users/runner/work/1/s/src/mono/mono/metadata/native-library.c"
000000000022d43b movl $0x112, %esi
000000000022d440 callq _mono_assertion_message_unreachable
000000000022d445 nopw %cs:(%rax,%rax)
000000000022d44f nop