[X86][SSE] Add domain crossing support for target shuffle combines.

Add the infrastructure to flag whether float and/or int domains are permitable.

A future patch will enable domain crossing based off shuffle depth and the value types of the source vectors.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@295604 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed