[clang] Reland Print library module manifest path again (PR #84881)

[Mark de Wever via cfe-commits]

mordante wrote:

Build system don't use this yet (since it wasn't available). I know CMake is working on implementing modules using libc++. Looking at the stage of the release I feel less comfortable to propose new features. So I think the feature should not be back ported.

I'm happy to pick this up, I expect to have time for it tomorrow.

https://github.com/llvm/llvm-project/pull/84881