Add test for strict mode of module code

test/language/module-code/strict-mode.js

@@ -0,0 +1,12 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: Module code is always strict mode code.
+es6id: 10.2.1
+id: sec-strict-mode-code
+flags: [module]
+negative: SyntaxError
+---*/
+
+$ERROR('This statement should not be executed.');
+var public;