[X86] Add test case for missed opportunity to commute vunpckhpd to enable use of vmovlps to fold a load.

We do this transform for SSE, but not AVX or AVX512VL.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337356 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed