[X86] optimize masked truncated saturating stores (#169827) Combine the saturating operation into the masked truncating store. https://godbolt.org/z/n1YfavKP6 ```asm _mm256_mask_cvtusepi16_storeu_epi8_manual: # @_mm256_mask_cvtusepi16_storeu_epi8_manual kmovd k1, esi vmovdqa ymm0, ymmword ptr [rdx] vpminuw ymm0, ymm0, ymmword ptr [rip + .LCPI0_0] vpmovwb xmmword ptr [rdi] {k1}, ymm0 vzeroupper ret _mm256_mask_cvtusepi16_storeu_epi8_intrinsic: # @_mm256_mask_cvtusepi16_storeu_epi8_intrinsic kmovd k1, esi vmovdqa ymm0, ymmword ptr [rdx] vpmovuswb xmmword ptr [rdi] {k1}, ymm0 vzeroupper ret ```
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