r600: Use deque and simplify loops in AMDGPUCFGStructurizer

Signed-off-by: Jan Vesely <jan.vesely@rutgers.edu>
Reviewed-by: Matt Arsenault <Matthew.Arsenault@amd.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232180 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed