[lld] [lld][ELF] Add --debug-names to create merged .debug_names. (PR #86508)

[Fangrui Song via llvm-commits]

MaskRay wrote:

> I have now brought over all the changes from maskray's branch, and also updated the commit message as requested. I believe this is ready for reviews now.

I've noticed that the current commit stack doesn't include any commits directly authored by me (note: committer information is completely ignored by github).

To make the collaboration history clearer, I'd recommend resetting the commit to https://github.com/MaskRay/llvm-project/tree/lld-debug-names-for-cmtice.
This way, your comment changes will be easily attributed to you.
There are a few key modifications we can still discuss to reach an optimal solution.

While simply adding "This work was co-authored with maskray." wouldn't suffice, including the following message would accurately reflect my contributions:

```
Co-authored-by: Fangrui Song <i at maskray.me>
```

(This is why I previously suggested adopting the commit message from https://github.com/MaskRay/llvm-project/commits/lld-debug-names/ verbatimly.)

(Under normal circumstances, even with extensive edits, I wouldn't typically request co-authorship. However, in this specific case, the significant amount of time and effort I've invested, including performance enhancements, bug fixes, and substantial style changes, hopefully warrants co-author credit. The current top commit doesn't fully reflect this level of involvement.)


https://github.com/llvm/llvm-project/pull/86508