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Summary: FlattenCFG merges two 'if' basicblocks by inserting one basicblock to another basicblock. The inserted basicblock can have a successor that contains a PHI node whoes incoming basicblock is the inserted basicblock. Since the existing code does not handle it, it becomes a badref. if (cond1) statement if (cond2) statement successor - contains PHI node whose predecessor is cond2 --> if (cond1 || cond2) statement (BB for cond2 was deleted) successor - contains PHI node whose predecessor is cond2 --> bad ref! Author: Jaebaek Seo Reviewers: asbirlea, kuhar, tstellar, chandlerc, davide, dexonsmith Reviewed By: kuhar Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D68032 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@372989 91177308-0d34-0410-b5e6-96231b3b80d8