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

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

Latest compile-time numbers are

https://llvm-compile-time-tracker.com/compare.php?from=e5948b4f805a95d129623a36f1fffd9f60ad4e37&to=5b575ccfc444e674c0cfef3e8a9916e9dadf42fb&stat=instructions%3Au


```
stage1-O3: +0.02%
stage1-ReleaseThinLTO: +0.04%
stage1-ReleaseLTO-g: +0.05%
stage1-O0-g: -0.00%
stage1-aarch64-O3: +0.05%
stage2-O3: +0.03%
stage2-clang: +0.04%
```

Not sure if we are OK with that for this kind of change?

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