[X86][AVX512] Add missing scheduling class tag for KMOVB/KMOVW/KMOVD/KMOVQ moves/loads/stores.

We only tagged it with the itinerary class, so completeness checks were erroneously passed (PR35639).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@324905 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed