[llvm] [SeparateConstOffsetFromGEP] Support multiple indices in reorderGEP (PR #92339)

[Nikita Popov via llvm-commits]

nikic wrote:

Putting this up in the hope that it helps with https://github.com/llvm/llvm-project/pull/68882#issuecomment-2108684748.

I've fixed a bug in the inbounds propagation I noticed while writing this in https://github.com/llvm/llvm-project/commit/b4d1a606c7492d827aff6ff0c1c109adff1253b9.

https://github.com/llvm/llvm-project/pull/92339