[llvm] SCEV: teach isImpliedViaOperations about samesign (PR #124270)

[Nikita Popov via llvm-commits]

https://github.com/nikic approved this pull request.

LGTM, I agree we don't need to block this on LFTR regressions.

We can check if something along the lines of https://github.com/llvm/llvm-project/pull/126086 would be worthwhile separately.

https://github.com/llvm/llvm-project/pull/124270