Craig Topper bf6495fbcb [LoopRotate] processLoop should return true even if it just simplified the loop latch without making any other changes ...

Simplifying a loop latch changes the IR and we need to make sure the pass manager knows to invalidate analysis passes if that happened.

PR35210 discovered a case where we failed to invalidate the post dominator tree after this simplification because we no changes other than simplifying the loop latch.

Fixes PR35210.

Differential Revision: https://reviews.llvm.org/D40035

llvm-svn: 318237

2017-11-15 00:22:42 +00:00

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