[clang] [clang][modules-driver] Add dependency scan and dependency graph (PR #152770)

[Naveen Seth Hanig via cfe-commits]

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@@ -99,5 +100,6 @@ add_clang_library(clangDriver
   LINK_LIBS
   clangBasic
   clangLex
+  clangDependencyScanning
----------------
naveen-seth wrote:

I'll try to land this as a separate PR first; I think the only reusable code for this might be [`isJobForDependencyScan`](
https://github.com/naveen-seth/llvm-project/blob/f1d92657d1d47bd1f436546d823bc75757e1443a/clang/lib/Driver/ModulesDriver.cpp#L1382).

Apologies for the delay, I haven’t been able to work on this during the week, but I’ll be back to it by Friday at the earliest or Monday at the latest.

https://github.com/llvm/llvm-project/pull/152770