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

[Michael Buch via llvm-commits]

Michael137 wrote:

Nevermind from what I can tell it really is just the number of extra `DW_AT_object_pointer`. There's `208713` `DW_TAG_subprogram`s in my example. So a large chunk of those got the attribute (`169958`). The majority of them don't have a corresponding definition `DW_TAG_subprogram`, which is where the spike came from

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