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

[Alexander Yermolovich via llvm-commits]

ayermolo wrote:

> > > added test as suggested by @ayermolo I believe we're looking good to merge now?
> > 
> > 
> > The above forward declarations should _not_ end up in the name lookup as that will violate the DWARF spec.
> 
> As I mentioned in the comment, this is not related to any of the IDX_Parent work; it happens in baseline LLVM as well. I believe it is a bug that just got fixed in #77511

That fix was more about in which accelerator table entry would get added, which would lead to runtime assert.

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