[X86] Teach the execution domain fixing tables to use movlhps inplace of unpcklpd for the packed single domain.

MOVLHPS has a smaller encoding than UNPCKLPD in the legacy encodings. With VEX and EVEX encodings it doesn't matter.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313509 91177308-0d34-0410-b5e6-96231b3b80d8
42 files changed