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Summary: Check that we're using SCEV for the same loop we're simulating. Otherwise, we might try to use the iteration number of the current loop in SCEV expressions for inner/outer loops IVs, which is clearly incorrect. Reviewers: chandlerc, hfinkel Subscribers: sanjoy, llvm-commits, mzolotukhin Differential Revision: http://reviews.llvm.org/D17632 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@261958 91177308-0d34-0410-b5e6-96231b3b80d8