[clang] [clang][Dependency Scanning] Report Exported Modules during Scanning (PR #137421)

[Cyndy Ishida via cfe-commits]

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@@ -115,6 +115,15 @@ struct ModuleID {
   }
 };
 
+struct ExtendedModuleID {
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cyndyishida wrote:

nit: why not use a `std::pair`? It comes with operator overloads.
Also, assuming this field is only intended for representing objects in `ClangModuleDeps`, maybe the type should be named `ClangModuleDepInfo`?

Otherwise, it's not clear to me why & when a `ModuleID` needs to be extended. 

https://github.com/llvm/llvm-project/pull/137421