Fix the behavior of 'super.foo' assignment when receiver is not an object.

test/mjsunit/es6/regress/regress-4097.js

+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+(function () {
+   "use strict";

[arv (Not doing code reviews), 2015/05/12 16:44:20]

wrong indentation... use 2 spaces

[Dmitry Lomov (no reviews), 2015/05/12 16:50:18]

Done.

+   class A {
+     s() {
+          super.bla = 10;

[arv (Not doing code reviews), 2015/05/12 16:44:20]

Can we also add tests for reading?

[Dmitry Lomov (no reviews), 2015/05/12 16:50:17]

Done.

+     }
+   };
+
+   let a = new A();
+   (new A).s.call(a);
+   assertEquals(10, a.bla);
+   assertThrows(function() { (new A).s.call(undefined); }, TypeError);
+   assertThrows(function() { (new A).s.call(42); }, TypeError);
+   assertThrows(function() { (new A).s.call(null); }, TypeError);
+   assertThrows(function() { (new A).s.call("abc"); }, TypeError);
+})()