[Headers][X86] Add constexpr support for some AVX512 int to f16 intrinsics. (#159231) Added constexpr to the remaining intrinsics: _mm256_cvtepu16_ph _mm256_mask_cvtepu16_ph _mm256_maskz_cvtepu16_ph _mm256_cvtepi32_ph _mm256_mask_cvtepi32_ph _mm256_maskz_cvtepi32_ph _mm256_cvtepu32_ph _mm256_mask_cvtepu32_ph _mm256_maskz_cvtepu32_ph Last part fixing #155798
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