Philip Reames 09d879d060 [SCEV] Common code for computing trip count in a fixed type [NFC-ish] ...

This is a follow on to D147117 and D147355. In both cases, we were adding special cases to compute zext(BTC+1) instead of zext(BTC)+1 when the BTC+1 computation was known not to overflow.

Differential Revision: https://reviews.llvm.org/D148661

2023-04-25 12:04:42 -07:00

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