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

[Sumanth Gundapaneni via llvm-commits]

sgundapa wrote:

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

I was about to push a similar change.
It did solve the regression I have seen.  Thanks for the patch. 

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