However as AndyKelley notes elsewhere in these comments, that variant of LLD hasn't seen progress in years.
That said, that AtomLLD appears to be a side-project of LLD, LLVM's LD project, which appears well-supported on Linux (ELF) and experimental on Windows (PE/COFF).
Its "atom"-based concept carried over into LLVM's experimental ATOM-based ld: https://lld.llvm.org/AtomLLD.html
However as AndyKelley notes elsewhere in these comments, that variant of LLD hasn't seen progress in years.
That said, that AtomLLD appears to be a side-project of LLD, LLVM's LD project, which appears well-supported on Linux (ELF) and experimental on Windows (PE/COFF).
I wonder what Apple's plans are.