Merging rr217102:
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r217102 | majnemer | 2014-09-03 16:03:18 -0700 (Wed, 03 Sep 2014) | 11 lines
IndVarSimplify: Don't let LFTR compare against a poison value
LinearFunctionTestReplace tries to use the *next* indvar to compare
against when possible. However, it may be the case that the calculation
for the next indvar has NUW/NSW flags and that it may only be safely
used inside the loop. Using it in a comparison to calculate the exit
condition could result in observing poison.
This fixes PR20680.
Differential Revision: http://reviews.llvm.org/D5174
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_35@223637
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