[X86] Enable EVEX GFNI instructions without avx512bw.

We only really need avx512bw for masking 256 or 512 bit GFNI
instructions due to the need for v32i1 or v64i1.

I wanted to enable 128-bit intrinsics with avx512vl, but the
__builtin_ia32_selectb_128 used in the header file requires avx512bw.
The codegen test for the same is also not using a masked instruction
because vselect with v16i1 mask and v16i8 is not legal so is expanded
before isel. To fix these issues we need a mask specific builtin and a
mask specific ISD opcode.

Fixes PR58687.

Reviewed By: pengfei

Differential Revision: https://reviews.llvm.org/D137036