[lld] [lld/COFF] Handle -start-lib / -end-lib better in /reproduce: output (PR #119752)

[Nico Weber via llvm-commits]

nico wrote:

> > lld/test/ELF/reproduce-thin-archive.s lld/test/MachO/reproduce-thin-archive-objc.s lld/test/MachO/reproduce-thin-archives.s all exist, so someone seems to have thought about this in the past. We should probably do the same in the COFF port, if we aren't yet :)

=> #121512

https://github.com/llvm/llvm-project/pull/119752