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Summary:
Fix a case where FoldBranchToCommonDest() would bail out from doing CSE
when encountering a debug intrinsic. Handle that by skipping past the
debug intrinsics.
Also, as a minor refactoring, rename checkCSEInPredecessor() to
tryCSEWithPredecessor() to make it a bit more clear that the function
may remove instructions.
Reviewers: fhahn, craig.topper, dblaikie, xbolva00
Reviewed By: fhahn, xbolva00
Subscribers: vsk, davide, llvm-commits
Differential Revision: https://reviews.llvm.org/D46635
llvm-svn: 332698
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