Make CodeGenFunction::EmitDecl() recognise CXXClass/CXXStruct/CXXUnion.

llvm-svn: 52162
diff --git a/clang/lib/CodeGen/CGDecl.cpp b/clang/lib/CodeGen/CGDecl.cpp
index e7085fb..fe58ca0 100644
--- a/clang/lib/CodeGen/CGDecl.cpp
+++ b/clang/lib/CodeGen/CGDecl.cpp
@@ -35,6 +35,9 @@
   case Decl::Union:     // union X;
   case Decl::Class:     // class X;
   case Decl::Enum:      // enum X;
+  case Decl::CXXStruct: // struct X; [C++]
+  case Decl::CXXUnion:  // union X; [C++]
+  case Decl::CXXClass:  // class X; [C++]
     // None of these decls require codegen support.
     return;