[clang] [clang][DebugInfo] Attach `DISubprogram` to additional call variants (PR #166202)

[Djordje Todorovic via cfe-commits]

djtodoro wrote:

I guess a patch that handles this https://github.com/llvm/llvm-project/pull/166202#issuecomment-3484357651 can improve things here a lot.

https://github.com/llvm/llvm-project/pull/166202