[llvm] [AsmPrinter][DebugNames] Implement DW_IDX_parent entries (PR #77457)

[Jonas Devlieghere via llvm-commits]

https://github.com/JDevlieghere approved this pull request.

LGTM, thanks for doing this @felipepiovezan. I left two code style suggestions inline but while they're common in LLVM they're really a matter of preference so feel free to ignore them if this is more consistent with the surrounding code. 

https://github.com/llvm/llvm-project/pull/77457