Add missing copyright header

test/Bugs/HasOnlyWritableDataProperties-cross-context.js

@@ -1,3 +1,8 @@
+//-------------------------------------------------------------------------------------------------------
+// Copyright (C) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE.txt file in the project root for full license information.
+//-------------------------------------------------------------------------------------------------------
+
 function f() {
     var obj0 = {};
     obj1 = Object.create(obj0);