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Summary: Fixes PR23809. Without passing the context to SimplifyICmpInst, we would use the assume to prove that the condition feeding the assume is trivially true (see isValidAssumeForContext in ValueTracking.cpp), causing the removal of the assume which may be useful for later optimizations. Test Plan: pr23800.ll Reviewers: hfinkel, majnemer Reviewed By: hfinkel Subscribers: henryhu, llvm-commits, wengxt, broune, meheff, eliben Differential Revision: http://reviews.llvm.org/D10695 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240683 91177308-0d34-0410-b5e6-96231b3b80d8
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