[clang] [llvm] [InstCombine] Relax singleUse for GEP(p,add(x,constant)) to 2 GEPs (PR #209551)

[Nikita Popov via cfe-commits]

nikic wrote:

As for the change itself, I expect that this is going to be a very high impact change, so this should get some performance evaluation in advance.

https://github.com/llvm/llvm-project/pull/209551