[PATCH][AVX512] PMIN/PMAX intrinsics and patterns

[Cameron McInally]

Hey guys,

Here is a patch to support unmasked, signed and unsigned, PMIN/PMAX intrinsics.

The naming scheme is a bit wonky between the floating point MIN/MAX
and integer PMIN/PMAX intrinsics. So, I continued from the AVX2
PMIN/PMAX intrinsic names.

Also, I extrapolated the GNU Builtin names for AVX512, similar to the
other AVX512 intrinsics. AFAIK, those Builtin names have not been
release yet. I could be wrong about that though.

And, I do not have commit access.

Thanks,
Cameron
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