[llvm] [RFC] Emit dwarf data for signature-changed or new functions (PR #157349)

[Vladislav Dzhidzhoev via llvm-commits]

dzhidzhoev wrote:

> What do you think? The backtrace is different from the original one.
> Any suggestion on the current inlinedAt approach? Or change back to my previous suggestion to have a simple implementation with a special CompileUnit and then do more in DwarfDebug ([yonghong-song at be0cdea](https://github.com/yonghong-song/llvm-project/commit/be0cdea2369dcd6e9050b1d9de49559c19768491))?

I don't mind giving up "inlinedAt approach". It was just an idea, not a detailed plan.

https://github.com/llvm/llvm-project/pull/157349