[AVX512] Add patterns for zero-extending a mask that use the def of KMOVW/KMOVB without going through an EXTRACT_SUBREG and a MOVZX.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272625 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed