[llvm] [DebugInfo] Remap extracted DIAssignIDs in hotcoldsplit (PR #91940)

[Stephen Tozer via llvm-commits]

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

LGTM. Just so I understand correctly, we already had the right behaviour for inlining but not for hot cold split, and this patch just moves that behaviour to a place where both inlining and hot cold splitting will use it?

https://github.com/llvm/llvm-project/pull/91940