[llvm] Globalopt pass produces invalid debug info (PR #100654)

[Stephen Tozer via llvm-commits]

https://github.com/SLTozer approved this pull request.

Apologies for the delay, been on holiday for a bit. Patch LGTM, with some minor nits and a non-blocking comment/suggestion.

https://github.com/llvm/llvm-project/pull/100654