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

[David Blaikie via llvm-commits]

dwblaikie wrote:

> Wouldn't it be possible to set the existing DW_AT_artificial attribute instead of introducing vendor-specific extensions?

not sure if that'd connote either of the properties being expressed here (uncallable, and un-printable-returns) - for instance in C++, implicit ctors, assignment operators, and dtors are artificial but callable/printable returns based on ABI, so we couldn't have debuggers assuming artificial functions can't be called/have their return values printed.

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