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[IndVars] Set Changed if rewriteFirstIterationLoopExitValues changes …
…IR. PR38863 Currently, `rewriteFirstIterationLoopExitValues` does not set Changed flag even if it makes changes in the IR. There is no clear evidence that it can cause a crash, but it looks highly suspicious and likely invalid. Differential Revision: https://reviews.llvm.org/D51779 Reviewed By: skatkov llvm-svn: 341779
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Max Kazantsev
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Sep 10, 2018
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