…irstFaulting (#105595)

* Initial work

* FirstFaulting partially works

* Added template

* Trying to test first-faulting behavior

* Using BoundedMemory to test FirstFaulting behavior for LoadVector.

* Fix size in validation

* Added more helper functions. Added conditional select tests for LoadVectorFirstFaulting.

* Added first-faulting behavior tests for GatherVectorFirstFaulting

* Added GetFfr suffix-style APIs

* Fixing GatherVector tests

* Formatting

* Feedback

* Feedback

* Ensure the P/Invokes are blittable

* Fix build

* Remove checking for zeroes after the fault

* Added GatherVectorFirstFaultingVectorBases test template, but currently without the FirstFaulting test. Added SveFfrTest template.

* Mark GetFfr methods as side-effectful

* Verifying expected fault result. Test weaks.

* Fix build

* Add tracking of FFR register

somewhat workable

code cleanup

Remove FFR

Add all the GetFfr*

wip

Work with MskCns() model

Use physReg approach

Remove commented prototypes

working

Remove bunch of unnecessary code

Remove SpecialImport from GetFFR/SetFFR/LoadFirstFaulting

some more code cleanup

some fixup

* Change condition for PhysReg

* jit format

* Fix PoisonPage configuration while creating BoundedMemory

* Use mmap() instead of memalign() for memory allocation

* review feedback

* unspill for LoadVectorFirstFaulting as well

* Show error codes on failing failure

* Feedback

* Feedback

* Feedback

* Feedback

* Handle FFR correctly

* reuse some of the code

* Handle the special effect for SetFfr

* some fixes + test coverage

* do not zero init lvaFfrRegister

* reverted local change

* fix build break

* Fixing flags for OSX

* Fixup unix impl

* Trying to fix build

* Fix osx calls

* Fix unix impl - forgot to use 'value'

* Added default impl

* Updating error messages

* Attempt mprotect to determine which MAP_ANONYMOUS value to use

* Attempt mprotect to determine which MAP_ANONYMOUS value to use

* Add a way to query MAP_ANONYMOUS

* Add a way to query MAP_ANONYMOUS

* trying to figure out cmake reference

* trying to figure out cmake reference

* trying to figure out cmake reference

* forgot to add cpp files

* Use MemoryMappedFile and then use mprotect

* Minor cleanup

* Added XplatVirtualAlloc, hopefully it will work

* Fix build

* Fix build

* Update hwintrinsiccodegenarm64.cpp

* Trying to fix build

* Use SystemNative

* fix pinvoke

* Get rid of writeline

* Add mono check

* Fix misspelled word

* Check for wasm

* Fix build

* Use IsBrowser

* Check IsWasi

* Check IsBrowser a different way

* Check IsMonoRuntime

* Feedback. Check NETFRAMEWORK

* Simplify check

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Co-authored-by: Tanner Gooding <tagoo@outlook.com>
Co-authored-by: Kunal Pathak <Kunal.Pathak@microsoft.com>
Co-authored-by: Swapnil Gaikwad <swapnil.gaikwad@arm.com>

PersistedAssemblyBuilder didn't write field offset correctly when field offset
was 0. This fixes that, and adds a test to ensure the behaviour is working.

Fixes #105795