clang/Modules: Remove unused parameter from ModuleManager::removeModules

The other paremeters appear to be sufficient to determine which modules
have just been loaded and need to be removed, so stop collecting and
sending in that set explicitly.

clang/include/clang/Serialization/ModuleManager.h

@@ -255,9 +255,7 @@ public:
                             std::string &ErrorStr);
 
   /// Remove the modules starting from First (to the end).
-  void removeModules(ModuleIterator First,
-                     llvm::SmallPtrSetImpl<ModuleFile *> &LoadedSuccessfully,
-                     ModuleMap *modMap);
+  void removeModules(ModuleIterator First, ModuleMap *modMap);
 
   /// Add an in-memory buffer the list of known buffers
   void addInMemoryBuffer(StringRef FileName,

clang/lib/Serialization/ASTReader.cpp

@@ -4185,11 +4185,7 @@ ASTReader::ASTReadResult ASTReader::ReadAST(StringRef FileName,
   case VersionMismatch:
   case ConfigurationMismatch:
   case HadErrors: {
-    llvm::SmallPtrSet<ModuleFile *, 4> LoadedSet;
-    for (const ImportedModule &IM : Loaded)
-      LoadedSet.insert(IM.Mod);
-
-    ModuleMgr.removeModules(ModuleMgr.begin() + NumModules, LoadedSet,
+    ModuleMgr.removeModules(ModuleMgr.begin() + NumModules,
                             PP.getLangOpts().Modules
                                 ? &PP.getHeaderSearchInfo().getModuleMap()
                                 : nullptr);

clang/lib/Serialization/ModuleManager.cpp

@@ -219,10 +219,7 @@ ModuleManager::addModule(StringRef FileName, ModuleKind Type,
   return NewlyLoaded;
 }
 
-void ModuleManager::removeModules(
-    ModuleIterator First,
-    llvm::SmallPtrSetImpl<ModuleFile *> &LoadedSuccessfully,
-    ModuleMap *modMap) {
+void ModuleManager::removeModules(ModuleIterator First, ModuleMap *modMap) {
   auto Last = end();
   if (First == Last)
     return;