[X86] Only fold AND/ANDNP back to VSELECT if we know the predicated mask select is legal (#156663) By only checking type legality we didn't account for 128/256-bit ops being run on non-AVX512VL targets, or vXi8/i16 ops being run on non-AVX512BW targets This check is cropping up in several places now and I intend to hoist it out into a common helper, but this initial fix needs to be as clean as possible to be back ported to 21.X Fixes #156256
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