[llvm] [llvm][DebugInfo] Attach object-pointer to DISubprogram declarations (PR #122742)

[Michael Buch via llvm-commits]

Michael137 wrote:

Currently blocked on https://github.com/llvm/llvm-project/pull/123089 (this will fix the failing LLDB `TestConstThis.py` test)

https://github.com/llvm/llvm-project/pull/122742