Use the scalar MlasSgemm CopyPackB and TransposePackB implementation for RISCV
Add new define MLAS_TARGET_RISCV under _M_RISCV or __riscv. Add MLAS_TARGET_RISCV in check across MlasSgemmCopyPackB and MlasSgemmTransposePackB implementation to use 4 wide packing functions.
For RISCV, the MlasSgemmKernel is used which has packing wide of 4. The default MlasSgemmCopyPackB (which was under just !defined(MLAS_TARGET_WASM_SCALAR) chack) has packing width of 16, causing the tests to mismatch.
@microsoft-github-policy-service agree [company="{Imagination Technologies}"]
@microsoft-github-policy-service agree company="Imagination Technologies"
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@yufenglee Can you review the changes?
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Stale.