[Dependency Scanning ]Revert: Remove Swift Overlay dependencies from the set of direct dependencies

Author: artemcm

include/swift/DependencyScan/ModuleDependencyScanner.h

@@ -120,7 +120,8 @@ class ModuleDependencyScanner {
       const ModuleDependencyID &moduleID,
       const std::vector<std::string> &clangDependencies,
       ModuleDependenciesCache &cache,
-      ModuleDependencyIDSetVector &swiftOverlayDependencies);
+      ModuleDependencyIDSetVector &swiftOverlayDependencies,
+      ModuleDependencyIDSetVector &directDependencies);
 
   /// Identify all cross-import overlay modules of the specified
   /// dependency set and apply an action for each.

lib/DependencyScan/ModuleDependencyScanner.cpp

@@ -519,7 +519,7 @@ ModuleDependencyScanner::resolveDirectModuleDependencies(
 
   // Find all Swift overlays that this module depends on.
   resolveSwiftOverlayDependencies(moduleID, allClangModules, cache,
-                                  swiftOverlayDependencies);
+                                  swiftOverlayDependencies, directDependencies);
 
   // Resolve the dependency info with dependency module information.
   cache.resolveDependencyImports(moduleID, directDependencies.getArrayRef());
@@ -674,7 +674,8 @@ void ModuleDependencyScanner::resolveSwiftOverlayDependencies(
     const ModuleDependencyID &moduleID,
     const std::vector<std::string> &clangDependencies,
     ModuleDependenciesCache &cache,
-    ModuleDependencyIDSetVector &swiftOverlayDependencies) {
+    ModuleDependencyIDSetVector &swiftOverlayDependencies,
+    ModuleDependencyIDSetVector &directDependencies) {
   llvm::StringMap<llvm::Optional<ModuleDependencyVector>>
       swiftOverlayLookupResult;
   for (const auto &clangDep : clangDependencies)
@@ -705,18 +706,29 @@ void ModuleDependencyScanner::resolveSwiftOverlayDependencies(
   // Aggregate both previously-cached and freshly-scanned module results
   auto recordResult = [&cache, &swiftOverlayLookupResult,
                        &swiftOverlayDependencies,
+                       &directDependencies,
                        moduleID](const std::string &moduleName) {
     auto lookupResult = swiftOverlayLookupResult[moduleName];
     if (moduleName != moduleID.ModuleName) {
       if (lookupResult == llvm::None) {
         const ModuleDependencyInfo *cachedInfo = cache.findDependency(moduleName).value();
         swiftOverlayDependencies.insert({moduleName, cachedInfo->getKind()});
+        // FIXME: Once all clients know to fetch these dependencies from
+        // `swiftOverlayDependencies`, the goal is to no longer have them in
+        // `directDependencies` so the following will need to go away.
+	directDependencies.insert({moduleName, cachedInfo->getKind()});
       } else {
         // Cache discovered module dependencies.
         cache.recordDependencies(lookupResult.value());
-        if (!lookupResult.value().empty())
+        if (!lookupResult.value().empty()) {
           swiftOverlayDependencies.insert(
                                           {moduleName, lookupResult.value()[0].first.Kind});
+          // FIXME: Once all clients know to fetch these dependencies from
+          // `swiftOverlayDependencies`, the goal is to no longer have them in
+          // `directDependencies` so the following will need to go away.
+	  directDependencies.insert(
+                                    {moduleName, lookupResult.value()[0].first.Kind});
+	}
       }
     }
   };