[lld] [llvm] [DTLTO][ELF][COFF] Add archive support for DTLTO. (PR #157043)

[Teresa Johnson via llvm-commits]

https://github.com/teresajohnson commented:

Thanks, this looks better but you aren't taking advantage of the polymorphism, comments and suggestions below.

https://github.com/llvm/llvm-project/pull/157043