[clang] [llvm] [clang][DebugInfo] Emit DW_AT_object_pointer on function declarations with explicit `this` (PR #122928)

[David Blaikie via cfe-commits]

dwblaikie wrote:

yeah, I was going to say - thought we carved out part (the debug info part, maybe some other things - ORC?) of the C API as unstable, so I'm OK continuing with that (lack of) guarantee...

https://github.com/llvm/llvm-project/pull/122928