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[Mono] Intrinsify Vector128:ExtractMostSignificantBits on ARM64 and AMD64 #76025

@fanyang-mono

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@fanyang-mono

WASM has added intrinsics support for Vector128:ExtractMostSignificantBits, where they saw big performance gain on a few Span and Json API's.
Implement intrinsics support for ExtractMostSignificantBits on:

  • ARM64 mini JIT
  • ARM64 LLVM
  • AMD64 mini JIT
  • AMD64 LLVM

NOTE: Additionally, investigate if Vector64 variant could be easily handled by the change.

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