[clang] [clang][DependencyScanning] Track modules that resolve from sysroot. (PR #130634)

[Michael Spencer via cfe-commits]

https://github.com/Bigcheese commented:

Overall I think this looks good. I'm not sure I share the same concerns. The situation this covers is how likely is it that the build system is going to determine this needs to be rebuilt, and that happens (in most cases) purely based on the reported dependencies. So negative deps or unlisted deps don't change anything here.

https://github.com/llvm/llvm-project/pull/130634