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Summary: This patch teaches ADCE to preserve both DominatorTrees and PostDominatorTrees. I didn't notice any performance impact when bootstrapping clang with this patch. The patch was originally committed in r311039 and reverted in r311049. This revision fixes the problem with not adding a dependency on the DominatorTreeWrapperPass for the LegacyPassManager. Reviewers: dberlin, chandlerc, sanjoy, davide, grosser, brzycki Reviewed By: davide Subscribers: grandinj, zhendongsu, llvm-commits, david2050 Differential Revision: https://reviews.llvm.org/D35869 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@311057 91177308-0d34-0410-b5e6-96231b3b80d8