[X86] Remove the X86ISD::MOVLHPD. Lowering doesn't use it and it's not a real instruction.

It was used in patterns, but we had the exact same patterns with Unpckl as well. So now just use Unpckl in the instruction patterns.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313506 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed