R600: Consider KILLGT as an ALU instruction

Mesa does not override llvm behavior wrt KILLGT anymore so llvm
has to handle KILLGT on its own.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178664 91177308-0d34-0410-b5e6-96231b3b80d8
R600: Simplify data structure and add DEBUG to R600ControlFlowFinalizer

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178665 91177308-0d34-0410-b5e6-96231b3b80d8