[llvm] [InstCombine] Lower multi-dimensional GEP to ptradd (PR #150383)

[Slava Zakharin via llvm-commits]

vzakhari wrote:

Hi @usha1830! Thank you for working on this!

> And yes, I see a lot of test failures and am looking into addressing those.

Please let me know if I can help investigating/resolving the failures.  I am looking forward to enabling the `noalias` setting in Flang, so if there is a work to share, I am here to help.

https://github.com/llvm/llvm-project/pull/150383