[AST] Add missing MultiplexConsumer::CompleteExternalDeclaration

Author: rnk

clang/include/clang/Frontend/MultiplexConsumer.h

@@ -65,6 +65,7 @@ class MultiplexConsumer : public SemaConsumer {
   void HandleTopLevelDeclInObjCContainer(DeclGroupRef D) override;
   void HandleImplicitImportDecl(ImportDecl *D) override;
   void CompleteTentativeDefinition(VarDecl *D) override;
+  void CompleteExternalDeclaration(VarDecl *D) override;
   void AssignInheritanceModel(CXXRecordDecl *RD) override;
   void HandleVTable(CXXRecordDecl *RD) override;
   ASTMutationListener *GetASTMutationListener() override;

clang/lib/Frontend/MultiplexConsumer.cpp

@@ -322,6 +322,11 @@ void MultiplexConsumer::CompleteTentativeDefinition(VarDecl *D) {
     Consumer->CompleteTentativeDefinition(D);
 }
 
+void MultiplexConsumer::CompleteExternalDeclaration(VarDecl *D) {
+  for (auto &Consumer : Consumers)
+    Consumer->CompleteExternalDeclaration(D);
+}
+
 void MultiplexConsumer::AssignInheritanceModel(CXXRecordDecl *RD) {
   for (auto &Consumer : Consumers)
     Consumer->AssignInheritanceModel(RD);