Remove emitter unit tests which are not supported and add MoveScalar …

[khushal1996]

Instruction format which are supported in JIT -->

Emitter unit tests which are failing -->

    theEmitter->emitIns_Mov(INS_movq, EA_8BYTE, REG_R16, REG_XMM0, false);
    theEmitter->emitIns_Mov(INS_movq, EA_8BYTE, REG_R16, REG_XMM16, false);

These tests fail since following is not supported in JIT

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[Copilot]

Pull Request Overview

This PR removes emitter unit tests that invoke unsupported instructions and adds new MoveScalar and StoreScalar tests for vector operations on 64‐bit integers.

• Removed failing emitter unit tests that use INS_movq with 8-byte operations.
• Added new tests for MoveScalar (SimpleUnOpTest.template) and StoreScalar (StoreUnOpTest.template) for Int64 and UInt64 types.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/tests/Common/GenerateHWIntrinsicTests/GenerateHWIntrinsicTests_X86.cs	Added new MoveScalar and StoreScalar test cases to verify vector operations on 64-bit integers.
src/coreclr/jit/codegenxarch.cpp	Removed two emitter calls using INS_movq that are unsupported in JIT.

Comments suppressed due to low confidence (2)

src/tests/Common/GenerateHWIntrinsicTests/GenerateHWIntrinsicTests_X86.cs:447

• The test validation 'result[0] != result[0]' will always evaluate to false. Please update it to a meaningful check that verifies the correctness of the MoveScalar operation.

 ("SimpleUnOpTest.template",         new Dictionary<string, string> { ["Isa"] = "Sse2", ["LoadIsa"] = "Sse2", ["Method"] = "MoveScalar",                               ["RetVectorType"] = "Vector128", ["RetBaseType"] = "Int64",  ["Op1VectorType"] = "Vector128", ["Op1BaseType"] = "Int64", ... ["ValidateFirstResult"] = "result[0] != result[0]", ... })

src/tests/Common/GenerateHWIntrinsicTests/GenerateHWIntrinsicTests_X86.cs:448

• The test validation 'result[0] != result[0]' is ineffective as a check and will always fail. Consider replacing it with a proper assertion that verifies the expected outcome of the MoveScalar operation.

 ("SimpleUnOpTest.template",         new Dictionary<string, string> { ["Isa"] = "Sse2", ["LoadIsa"] = "Sse2", ["Method"] = "MoveScalar",                               ["RetVectorType"] = "Vector128", ["RetBaseType"] = "UInt64", ["Op1VectorType"] = "Vector128", ["Op1BaseType"] = "UInt64", ... ["ValidateFirstResult"] = "result[0] != result[0]", ... })

[khushal1996]

@dotnet/intel for review.