[clang] [llvm] [clang][deps] Track directory dependencies of modules (PR #222202)

[Vassil Vassilev via llvm-commits]

https://github.com/vgvassilev commented:

Looks reasonable to me. Any chance to reduce the std::string or std::vector<std::string> state?

https://github.com/llvm/llvm-project/pull/222202