Max Kazantsev 6022a8b7e8 [SCEV] Drop cached ranges of AddRecs after flag update ...

Our range computation methods benefit from no-wrap flags. But if the ranges
were first computed before the flags were set, the cached range will be too
pessimistic.

We need to drop cached ranges whenever we sharpen AddRec's no wrap flags.

Differential Revision: https://reviews.llvm.org/D89847
Reviewed By: fhahn

2020-11-10 12:37:12 +07:00

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