[llvm] [Dwarf][Transforms] Add dwarf support when func signature changed (PR #127855)

[Paul T Robinson via llvm-commits]

pogo59 wrote:

@ayermolo is correct about what I meant.

It's an interesting case, and other consumers may well want to know about it. Exploring this with a vendor-specific implementation is the correct way forward. If it turns out to be genuinely useful, it would be worth proposing as a new feature in DWARF v6.

Right now, though, my question is basically, how much size increase do we see in the DWARF with this new feature? If it's very small (maybe the optimization does not fire very often), then there's not much harm in emitting the info all the time, as the patch currently implements it. If there's a noticeable increase, though, that's a concern for some vendors and we might want to limit the situations where the info is emitted.

https://github.com/llvm/llvm-project/pull/127855