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b3fbd56f82
This moves WidenIV from IndVarSimplify to Utils/SimplifyIndVar so that we have createWideIV available as a generic helper utility. I.e., this is not only useful in IndVarSimplify, but could be useful for loop transformations. For example, motivation for this refactoring is the loop flatten transformation: if induction variables in a loop nest can be widened, we can avoid having to perform certain overflow checks, enabling this transformation. Differential Revision: https://reviews.llvm.org/D90421
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