[AVX512] Add avx512bw command lines to 128-bit idiv tests.

The multiply lowering on some of the tests can take advantage of the vpmovwb to simplify the truncate.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@314448 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed