[llvm] [ValueTracking] Support GEPs in matchSimpleRecurrence. (PR #123518)

[Florian Hahn via llvm-commits]

fhahn wrote:

> > @fhahn Can you check this case https://gist.github.com/dtcxzyw/10abd2cd4d869ef6434625bfb0de6c46? Before this patch, `@_ZN5clang7targetsL7AVRMcusE` is marked as a constant.
> 
> Yes I have a reproducer for this and will share a fix soon.

Put up https://github.com/llvm/llvm-project/pull/125205 but I am not sure if I am missing anything there

https://github.com/llvm/llvm-project/pull/123518