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that the symbolic evaluator is not always able to use subtraction to remove expressions. This makes the code faster, and fixes the last crash on 178.galgel. Finally, add a statistic to see how many phi nodes are inserted. On 178.galgel, we get the follow stats: 2562 loop-reduce - Number of PHIs inserted 3927 loop-reduce - Number of GEPs strength reduced git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22662 91177308-0d34-0410-b5e6-96231b3b80d8
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