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A thin archive is an archive/library format where the archive itself contains only references to member object files on disk, rather than embedding the file contents. For the non-/wholearchive case, we use the path to the archive member as the identifier for thin-archive members (see comments in `enqueueArchiveMember`). This patch modifies the /wholearchive path to behave the same way. Apart from consistency, my motivation for fixing this is DTLTO (#126654), where having the member identifier be the path on disk allows distribution of bitcode members during ThinLTO.
See docs/NewLLD.rst