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Balaram Makam 71dbdadf82 [Local] Fix a bug in the domtree update logic for MergeBasicBlockIntoOnlyPred.
Summary: For some irreducible CFG the domtree nodes might be dead, do not update domtree for dead nodes.

Reviewers: kuhar, dberlin, hfinkel

Reviewed By: kuhar

Subscribers: llvm-commits, mcrosier

Differential Revision: https://reviews.llvm.org/D38960

llvm-svn: 316582
2017-10-25 14:55:48 +00:00
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