[X86][SSE] Refreshed vector integer multiply tests

Add all 256-bit vector tests.
Added AVX512F/AVX512BW test targets.
Renamed tests something more meaningful.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264507 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed