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Sanjoy Das c35e5710c9 [SCEV] Track no-abnormal-exits instead of no-throw calls
Absence of may-unwind calls is not enough to guarantee that a
UB-generating use of an add-rec poison in the loop latch will actually
cause UB.  We also need to guard against calls that terminate the thread
or infinite loop themselves.

This partially addresses PR28012.

llvm-svn: 272181
2016-06-08 17:48:42 +00:00
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