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Summary: This patch moves root-finding logic from DominatorTreeBase to GenericDomTreeConstruction.h. It makes the behavior simpler and more consistent by always adding a virtual root to PostDominatorTrees. Reviewers: dberlin, davide, grosser, sanjoy Reviewed By: dberlin Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D35597 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309146 91177308-0d34-0410-b5e6-96231b3b80d8