Don't try to CodeGen using directives, from Anders Johnsen

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@80853 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CodeGenModule.cpp

@@ -1653,6 +1653,7 @@ void CodeGenModule::EmitTopLevelDecl(Decl *D) {
     break;
     // No code generation needed.
   case Decl::Using:
+  case Decl::UsingDirective:
   case Decl::ClassTemplate:
   case Decl::FunctionTemplate:
     break;