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* Now that ShrinkDemandedOps() is separated out from DAG combine. It sometimes ↵Evan Cheng2010-02-101-0/+13
leave some obvious nops which dag combine used to clean up afterwards e.g. (trunk (ext n)) -> n. Look for them and squash them. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95757 91177308-0d34-0410-b5e6-96231b3b80d8