[llvm] [SeparateConstOffsetFromGEP] propagate const offset through GEP chains (PR #143470)

[Krzysztof Drewniak via llvm-commits]

https://github.com/krzysz00 approved this pull request.

I can't see anything wrong here, so week approve from me (I'd give it a bit of time to see of other folks have thoughts)

https://github.com/llvm/llvm-project/pull/143470