WeakMap.prototype attributes

test/built-ins/WeakMap/prototype/prototype-attributes.js

+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 23.3.2.1
+description: >
+  WeakMap.prototype is not writable, not enumerable and not configurable.
+includes: [propertyHelper.js]
+---*/
+
+verifyNotEnumerable(WeakMap, 'prototype');
+verifyNotWritable(WeakMap, 'prototype');
+verifyNotConfigurable(WeakMap, 'prototype');