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- Walking over pred_begin/pred_end is an expensive operation. - PHINodes contain a value for each predecessor anyway. - While it may look like we used to save a few iterations with the set, be aware that getIncomingValueForBlock does a linear search on the values of the phi node. - Another -5% on ARMDisassembler.cpp (Release build). This was the last entry in the profile that was obviously wasting time. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145937 91177308-0d34-0410-b5e6-96231b3b80d8
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