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

[Paul T Robinson via llvm-commits]

pogo59 wrote:

Yes that lets us describe the multiple variations.

One point my suggestions does *not* address: which functions should be callable from the debugger, and which not callable? If the original function `foo` should not be callable (because it uses one of the modified parameter lists), we haven't done anything to indicate that. I think @dwblaikie was suggesting using the calling convention, would that work? Or do we need something else?

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