Add register mask support to RAGreedy.

This only adds the interference checks required for correctness.
We still need to take advantage of register masks for the
interference driven live range splitting.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150191 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed