Add VMOVD VMOVW APIs in JIT

[khushal1996]

This PR add the MoveScalar and StoreScalar APIs. With this, all instructions for Avx10.2 are now enabled in JIT.
API Issue #113090

Testing

Note1: Emitter unit tests not ran since they are added and verified along with AVX10.2 PR #111209

Encoding Correctness

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No "Decode Failure" found in the superpmi log with Avx10.2 coredistools.

Superpmi run asmdiffs

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Run JIT subtree with AVXVNNIINT* enabled / disabled

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Avx10.2 Enabled (SDE)

Avx10.2 disabled

[ghost]

Note regarding the new-api-needs-documentation label:

This serves as a reminder for when your PR is modifying a ref *.cs file and adding/modifying public APIs, please make sure the API implementation in the src *.cs file is documented with triple slash comments, so the PR reviewers can sign off that change.

[ghost]

Note regarding the new-api-needs-documentation label:

This serves as a reminder for when your PR is modifying a ref *.cs file and adding/modifying public APIs, please make sure the API implementation in the src *.cs file is documented with triple slash comments, so the PR reviewers can sign off that change.

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[khushal1996]

@dotnet/intel

[Copilot]

Pull Request Overview

This PR adds support for the VMOVD and VMOVW instructions by introducing the MoveScalar and StoreScalar APIs for AVX10v2 in the JIT. Key updates include:

• New MoveScalar and StoreScalar API definitions in the intrinsic reference and implementation.
• Updates to the hardware intrinsic list to include the new MoveScalar and StoreScalar operations.
• Addition of test templates for the new APIs in the JIT hardware intrinsics tests.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/tests/JIT/HardwareIntrinsics/X86_Avx10v2/Avx10v2SampleTest.cs	Added a sample test using MoveScalar API to confirm support when Avx10v2 is enabled.
src/tests/Common/GenerateHWIntrinsicTests/GenerateHWIntrinsicTests_X86.cs	Added test templates for MoveScalar and StoreScalar APIs to validate behavior.
src/libraries/System.Runtime.Intrinsics/ref/System.Runtime.Intrinsics.cs	Declared new MoveScalar and StoreScalar APIs.
src/libraries/System.Private.CoreLib/src/System/Runtime/Intrinsics/X86/Avx10v2.cs	Implemented new MoveScalar and StoreScalar APIs (as JIT intrinsic stubs).
src/libraries/System.Private.CoreLib/src/System/Runtime/Intrinsics/X86/Avx10v2.PlatformNotSupported.cs	Provided PlatformNotSupported implementations for the new APIs.
src/coreclr/jit/hwintrinsiclistxarch.h	Updated intrinsic list with entries for MoveScalar and StoreScalar.

Comments suppressed due to low confidence (2)

src/tests/Common/GenerateHWIntrinsicTests/GenerateHWIntrinsicTests_X86.cs:1820

• The validation expression in the MoveScalar test template is trivially false. Consider providing a meaningful check that compares the processed scalar value to the expected result.

"ValidateFirstResult": "result[0] != result[0]"

src/tests/Common/GenerateHWIntrinsicTests/GenerateHWIntrinsicTests_X86.cs:1896

• The validation expression in the StoreScalar test template does not effectively verify that the store operation was successful; consider updating it to explicitly compare the stored value with the expected source value.

"ValidateFirstResult": "value[0] != result[0]"