Adam Siemieniuk 2b71df5a74
[mlir][x86vector] AVX512-BF16 Convert packed F32 to BF16 (#125685)
Adds AVX512 bf16 conversion from packed f32 to bf16 elements.

Tests are slightly refactored to better follow file's convention.
2025-02-18 10:50:11 +01:00
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