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

[Cyndy Ishida via cfe-commits]

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@@ -739,6 +748,12 @@ ModuleDepCollectorPP::handleTopLevelModule(const Module *M) {
   MDC.ScanInstance.getASTReader()->visitInputFileInfos(
       *MF, /*IncludeSystem=*/true,
       [&](const serialization::InputFileInfo &IFI, bool IsSystem) {
+        if (MD.IsInSysroot) {
+          auto FullFilePath = ASTReader::ResolveImportedPath(
+              PathBuf, IFI.UnresolvedImportedFilename, MF->BaseDirectory);
+          MD.IsInSysroot = FullFilePath->starts_with(CurrSysroot);
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cyndyishida wrote:

There is one private to `Path.cpp` I could expose that? 

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