diff --git a/clang/lib/Sema/Sema.cpp b/clang/lib/Sema/Sema.cpp
index befe6ac..d096580 100644
--- a/clang/lib/Sema/Sema.cpp
+++ b/clang/lib/Sema/Sema.cpp
@@ -857,20 +857,13 @@
   }
 }
 
-/// ActOnEndOfTranslationUnit - This is called at the very end of the
-/// translation unit when EOF is reached and all but the top-level scope is
-/// popped.
-void Sema::ActOnEndOfTranslationUnit() {
-  assert(DelayedDiagnostics.getCurrentPool() == nullptr
-         && "reached end of translation unit with a pool attached?");
-
-  // If code completion is enabled, don't perform any end-of-translation-unit
-  // work.
-  if (PP.isCodeCompletionEnabled())
+void Sema::ActOnEndOfTranslationUnitFragment(TUFragmentKind Kind) {
+  // No explicit actions are required at the end of the global module fragment.
+  if (Kind == TUFragmentKind::Global)
     return;
 
   // Transfer late parsed template instantiations over to the pending template
-  // instantiation list. During normal compliation, the late template parser
+  // instantiation list. During normal compilation, the late template parser
   // will be installed and instantiating these templates will succeed.
   //
   // If we are building a TU prefix for serialization, it is also safe to
@@ -883,50 +876,79 @@
                                LateParsedInstantiations.end());
   LateParsedInstantiations.clear();
 
+  // If DefinedUsedVTables ends up marking any virtual member functions it
+  // might lead to more pending template instantiations, which we then need
+  // to instantiate.
+  DefineUsedVTables();
+
+  // C++: Perform implicit template instantiations.
+  //
+  // FIXME: When we perform these implicit instantiations, we do not
+  // carefully keep track of the point of instantiation (C++ [temp.point]).
+  // This means that name lookup that occurs within the template
+  // instantiation will always happen at the end of the translation unit,
+  // so it will find some names that are not required to be found. This is
+  // valid, but we could do better by diagnosing if an instantiation uses a
+  // name that was not visible at its first point of instantiation.
+  if (ExternalSource) {
+    // Load pending instantiations from the external source.
+    SmallVector<PendingImplicitInstantiation, 4> Pending;
+    ExternalSource->ReadPendingInstantiations(Pending);
+    for (auto PII : Pending)
+      if (auto Func = dyn_cast<FunctionDecl>(PII.first))
+        Func->setInstantiationIsPending(true);
+    PendingInstantiations.insert(PendingInstantiations.begin(),
+                                 Pending.begin(), Pending.end());
+  }
+
+  {
+    llvm::TimeTraceScope TimeScope("PerformPendingInstantiations",
+                                   StringRef(""));
+    PerformPendingInstantiations();
+  }
+
+  assert(LateParsedInstantiations.empty() &&
+         "end of TU template instantiation should not create more "
+         "late-parsed templates");
+}
+
+/// ActOnEndOfTranslationUnit - This is called at the very end of the
+/// translation unit when EOF is reached and all but the top-level scope is
+/// popped.
+void Sema::ActOnEndOfTranslationUnit() {
+  assert(DelayedDiagnostics.getCurrentPool() == nullptr
+         && "reached end of translation unit with a pool attached?");
+
+  // If code completion is enabled, don't perform any end-of-translation-unit
+  // work.
+  if (PP.isCodeCompletionEnabled())
+    return;
+
   // Complete translation units and modules define vtables and perform implicit
   // instantiations. PCH files do not.
   if (TUKind != TU_Prefix) {
     DiagnoseUseOfUnimplementedSelectors();
 
-    // If DefinedUsedVTables ends up marking any virtual member functions it
-    // might lead to more pending template instantiations, which we then need
-    // to instantiate.
-    DefineUsedVTables();
-
-    // C++: Perform implicit template instantiations.
-    //
-    // FIXME: When we perform these implicit instantiations, we do not
-    // carefully keep track of the point of instantiation (C++ [temp.point]).
-    // This means that name lookup that occurs within the template
-    // instantiation will always happen at the end of the translation unit,
-    // so it will find some names that are not required to be found. This is
-    // valid, but we could do better by diagnosing if an instantiation uses a
-    // name that was not visible at its first point of instantiation.
-    if (ExternalSource) {
-      // Load pending instantiations from the external source.
-      SmallVector<PendingImplicitInstantiation, 4> Pending;
-      ExternalSource->ReadPendingInstantiations(Pending);
-      for (auto PII : Pending)
-        if (auto Func = dyn_cast<FunctionDecl>(PII.first))
-          Func->setInstantiationIsPending(true);
-      PendingInstantiations.insert(PendingInstantiations.begin(),
-                                   Pending.begin(), Pending.end());
-    }
-
-    {
-      llvm::TimeTraceScope TimeScope("PerformPendingInstantiations",
-                                     StringRef(""));
-      PerformPendingInstantiations();
-    }
-
-    assert(LateParsedInstantiations.empty() &&
-           "end of TU template instantiation should not create more "
-           "late-parsed templates");
+    ActOnEndOfTranslationUnitFragment(
+        !ModuleScopes.empty() && ModuleScopes.back().Module->Kind ==
+                                     Module::PrivateModuleFragment
+            ? TUFragmentKind::Private
+            : TUFragmentKind::Normal);
 
     if (LateTemplateParserCleanup)
       LateTemplateParserCleanup(OpaqueParser);
 
     CheckDelayedMemberExceptionSpecs();
+  } else {
+    // If we are building a TU prefix for serialization, it is safe to transfer
+    // these over, even though they are not parsed. The end of the TU should be
+    // outside of any eager template instantiation scope, so when this AST is
+    // deserialized, these templates will not be parsed until the end of the
+    // combined TU.
+    PendingInstantiations.insert(PendingInstantiations.end(),
+                                 LateParsedInstantiations.begin(),
+                                 LateParsedInstantiations.end());
+    LateParsedInstantiations.clear();
   }
 
   DiagnoseUnterminatedPragmaPack();
@@ -1000,7 +1022,7 @@
     if (getLangOpts().getCompilingModule() ==
             LangOptions::CMK_ModuleInterface &&
         (ModuleScopes.empty() ||
-         ModuleScopes.back().Module->Kind != Module::ModuleInterfaceUnit) &&
+         !ModuleScopes.back().Module->isModulePurview()) &&
         !DiagnosedMissingModuleDeclaration) {
       // FIXME: Make a better guess as to where to put the module declaration.
       Diag(getSourceManager().getLocForStartOfFile(