[lld] [lld][ELF] Add /PASSTHRU/. #65087 (PR #84287)

[Bevin Hansson via llvm-commits]

bevin-hansson wrote:

> This seems to have a large design space. I believe proposers for this patch should keep following up on the https://sourceware.org/pipermail/binutils/2023-September/129373.html discussion.

I agree, but it doesn't seem to have gotten that much discussion. I will make a post and see if there's any more interest.

https://github.com/llvm/llvm-project/pull/84287