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2627e2f2e6
The current impl corrupts the comparison masks when converting from float back to bfloat16. The resulting masks are then no longer all zeros or all ones, which breaks when used with `pselect` (e.g. in `pmin<PropagateNumbers>`). This was causing `packetmath_15` to fail on arm. Introducing a simple `F32MaskToBf16Mask` corrects this (takes the lower 16-bits for each float mask).