[llvm] [SCEV] Match more URem patterns structurally (NFC). (PR #213078)

[Nikita Popov via llvm-commits]

nikic wrote:

Hm, if there's no significant improvement and we still have to keep the fallback code, it's probably not worth it.

This kind of does make me wonder whether we might just be better off having an explicit URem SCEV node, instead of trying to awkwardly recover it like this?

https://github.com/llvm/llvm-project/pull/213078