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
diff --git a/lib/CodeGen/CodeGenModule.cpp b/lib/CodeGen/CodeGenModule.cpp
index 428d8cc..802df06 100644
--- a/lib/CodeGen/CodeGenModule.cpp
+++ b/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;