[lld] [lld/COFF] Support thin archives in /reproduce: files (PR #121512)

[Martin Storsjö via llvm-commits]

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

LGTM, nice, thanks!

In the cases where I've run into this issue, I don't remember if the thin archives used absolute or relative paths though. I think the main cases where I've run into this are related to meson, where meson makes non-installed internal static libraries as thin libraries by default. It does seem like meson uses relative paths for those.

https://github.com/llvm/llvm-project/pull/121512