[x86] Add intrinsics for the pshufd, pshuflw, and pshufhw instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211694 91177308-0d34-0410-b5e6-96231b3b80d8
Add Polly to the ignored trees.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211695 91177308-0d34-0410-b5e6-96231b3b80d8
Code cleanup.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211697 91177308-0d34-0410-b5e6-96231b3b80d8