[X86][SSE] Add VZEXT_MOVL target shuffle decoding.

Add support for decoding VZEXT_MOVL target shuffle masks, allowing it to be used as a source in target shuffle combines.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@258215 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed