[llvm] [InstComb] Fold inttoptr (add (ptrtoint %B), %O) -> GEP for ICMP users. (PR #153421)

[Florian Hahn via llvm-commits]

fhahn wrote:

For this to be really useful we need to allow a few more cases where the pointer is only used as integer: https://github.com/llvm/llvm-project/pull/153566

This allows vectorizing std::find in some cases.

https://github.com/llvm/llvm-project/pull/153421