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

llvm-svn: 80853
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index 428d8cc..802df06 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -1653,6 +1653,7 @@
     break;
     // No code generation needed.
   case Decl::Using:
+  case Decl::UsingDirective:
   case Decl::ClassTemplate:
   case Decl::FunctionTemplate:
     break;