[llvm] [LoopInterchange] Reject interchange if non-reassociative reduction exists (PR #148612)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

It would be better to drop the nuw/nsw flags during the transform instead.

(Generally speaking, adding flags should never regress optimization.)

https://github.com/llvm/llvm-project/pull/148612