[lld] [lld,wasm] Introduce Ctx::arg (PR #119829)

[Sam Clegg via llvm-commits]

https://github.com/sbc100 approved this pull request.

I generally support changes that bring us closer to the way the ELF linker works, so this change LGTM.

As a said in the other PR I'm a little sad that the extra indirection and noise, but I guess its worth it for the library use case.



https://github.com/llvm/llvm-project/pull/119829