David Green 990eb1fc94 [Dominators] Fix some edge cases for PostDomTree updating ...

These fix some odd cfg cases where batch-updating the post
dom tree fails. Usually around infinite loops and roots
ending up being different.

Differential Revision: https://reviews.llvm.org/D42247

llvm-svn: 323034

2018-01-20 10:29:37 +00:00

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