[clang] [clang][DependencyScanning] Track modules that resolve from "shared" locations (PR #130634)

[Cyndy Ishida via cfe-commits]

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@@ -157,6 +157,32 @@ static void optimizeCWD(CowCompilerInvocation 
&BuildInvocation, StringRef CWD) {
   }
 }
 
+/// Check a subset of invocation options to determine whether the current
+/// context can safely be considered as shareable.
+static bool areOptionsInSharedDir(CowCompilerInvocation &BuildInvocation,
+                                  const ArrayRef<StringRef> SharedDirs) {
+  const auto &HSOpts = BuildInvocation.getHeaderSearchOpts();
+  if (!isPathInSharedDir(SharedDirs, HSOpts.Sysroot))
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cyndyishida wrote:

I can't think of this happening intentionally.

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