[lld] [llvm] [DTLTO][LLD][COFF] Add support for Integrated Distributed ThinLTO (PR #148594)

[Fangrui Song via llvm-commits]

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

I reviewed the patch alongside the ELF version, and they’re very similar. :) I’ve given my approval.

https://github.com/llvm/llvm-project/pull/148594