Jakub Kuderski e35a449140 [Dominators] Teach LoopUnswitch to use the incremental API ...

Summary:
This patch makes LoopUnswitch use new incremental API for updating dominators.
It also updates SplitCriticalEdge, as it is called in LoopUnswitch.

There doesn't seem to be any noticeable performance difference when bootstrapping clang with this patch.

Reviewers: dberlin, davide, sanjoy, grosser, chandlerc

Reviewed By: davide, grosser

Subscribers: mzolotukhin, llvm-commits

Differential Revision: https://reviews.llvm.org/D35528

llvm-svn: 311093

2017-08-17 16:45:35 +00:00

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