[clang] [clang][modules] Print library module manifest path. (PR #76451)

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

(This is another example that the github review can't work well with the reverted patches...)

@mordante I think you can add `// REQUIRES: x86-registered-target` to the test if @kaz7 can't respond quickly. It will skip the test on targets other than x86. And it should keep the CI green and enable us to backport this clang18.

We can still improve this later.

https://github.com/llvm/llvm-project/pull/76451