Skip over shadow using decls during codegen.

llvm-svn: 89079
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index e5712e1..0e6f4a6 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -1716,6 +1716,7 @@
     EmitNamespace(cast<NamespaceDecl>(D));
     break;
     // No code generation needed.
+  case Decl::UsingShadow:
   case Decl::Using:
   case Decl::UsingDirective:
   case Decl::ClassTemplate: