[AVX10.2]Optimize codegen for x86 using the new saturating conversion instructions when possible.

[DeepakRajendrakumaran]

AVX10.2 introduces a set of saturating conversion instructions. These will allow us to further optimize the various floating point-> integer conversions. Specifically cases where we are currently handling edge cases with additional instructions. With these new instructions, we can accomplish this with just 1 instruction

Eg. double -> ulong

This currently generates the following 2 instructions

vfixupimmsd 
vcvttsd2usi

The new Avx10.2 instructions are the following

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[JulieLeeMSFT]

@khushal1996, can we close this issue becuase @111775 is merged now?

[khushal1996]

@JulieLeeMSFT yes. we can close this now and the work related to this issue has been merged.