[X86][SSE] Ensure we're only combining shuffles with legal mask types.

I haven't managed to get this to fail yet but its technically possible for the AND -> shuffle decomposition to result in illegal types.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290183 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed