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

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

I think this change is going to have a very big impact on other transforms and will require lots of mitigation before it's viable. Especially after https://github.com/llvm/llvm-project/pull/137297 this is going to convert *all* GEPs into ptradd representation.

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