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The logic of replacing of a couple `RANGE_CHECK_LOWER + RANGE_CHECK_UPPER` into `RANGE_CHECK_BOTH` in fact duplicates the logic of range intersection which happens when we calculate safe iteration space. Effectively, the result of intersection of these ranges doesn't differ from the range of merged range check. We chose to remove duplicating logic in favor of code simplicity. Differential Revision: https://reviews.llvm.org/D39589 llvm-svn: 318508
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