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Summary: This patch implements incremental edge deletions. It also makes DominatorTreeBase store a pointer to the parent function. The parent function is needed to perform full rebuilts during some deletions, but it is also used to verify that inserted and deleted edges come from the same function. Reviewers: dberlin, davide, grosser, sanjoy, brzycki Reviewed By: dberlin Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D35342 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@308062 91177308-0d34-0410-b5e6-96231b3b80d8
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