[lld] [lld][MachO] Add --lto-emit-llvm command line option (PR #170355)

[Daniel Rodríguez Troitiño via llvm-commits]

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

Comparing the new code to the ELF implementation it seems to duplicate the existing code, so I think this looks good to me. You might want to wait a little before merging in case someone else wants to have a look.

https://github.com/llvm/llvm-project/pull/170355