Sanjay Patel 0ab0c1a201 [SimplifyCFG] don't sink common insts too soon (PR34603) ...

This should solve:
https://bugs.llvm.org/show_bug.cgi?id=34603
...by preventing SimplifyCFG from altering redundant instructions before early-cse has a chance to run.
It changes the default (canonical-forming) behavior of SimplifyCFG, so we're only doing the
sinking transform later in the optimization pipeline.

Differential Revision: https://reviews.llvm.org/D38566

llvm-svn: 320749

2017-12-14 22:05:20 +00:00

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