[Mono][Win] Incorrect decomposition of simd calls

[saitama951]

simd decomposition for OP_ARG cases for simd calls in handled incorrectly
currently the decomposition intrinsic takes place based on a xcall but later on this xcall is decomposed into a vcall where the return register is removed.

fixes #116287

[dotnet-policy-service]

Tagging subscribers to this area: @steveisok, @vitek-karas
See info in area-owners.md if you want to be subscribed.

[saitama951]

cc: @lateralusX

[lateralusX]

@saitama951 change seems to trigger some intrinsics error. Maybe we should keep the switch with instructions to decompose if the uses_simd_intrinsics is false. So pretty much add your exclude of the xcall ops in decompose_vtype_opt_uses_simd_intrinsics then keep the check on the uses_simd_intrinsics + the switch to decompose a well known set of SIMD ops as last option.

[saitama951]

Done @lateralusX ,
All the test cases passes on windows.
Other failures seem to be unrelated.

[saitama951]

I see a failure on windows-x64-release, looks to be unrelated to this change?

BEGIN EXECUTION
 "C:\h\w\B35D09DE\p\corerun.exe" -p "System.Reflection.Metadata.MetadataUpdater.IsSupported=false" -p "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization=true"  nativeruntimeeventsource.dll 
buffer length=16
DOOVERLAPPEDIO
(Listener) [63, (Failed to listen, Was not heard or didn't fire)]
(Listener) [64, (Failed to listen, Was not heard or didn't fire)]
(Listener) [65, (Failed to listen, Was not heard or didn't fire)]




System.Exception: Condition 'listener.EventCount > 0' is not true
   at Tracing.Tests.NativeRuntimeEventSourceTest.Assert2.True(String name, Boolean condition)
   at Tracing.Tests.NativeRuntimeEventSourceTest.TestEntryPoint()
   at __GeneratedMainWrapper.Main()
Expected: 100
Actual: 101

[saitama951]

@lateralusX can this be merged?