ES6: Make function name configurable

test/mjsunit/regress/regress-1530.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 62 matching lines @@
 assertSame(f.prototype.foo, 'final');
 assertSame(new f().foo, 'final');
 assertSame(Object.getPrototypeOf(new f()), d);
 assertSame(Object.getOwnPropertyDescriptor(f, 'prototype').value, d);
 assertFalse(Object.getOwnPropertyDescriptor(f, 'prototype').writable);
 
 // Verify that non-writability of redefined 'prototype' is respected.
 assertThrows("'use strict'; f.prototype = {}");
 assertThrows("Object.defineProperty(f, 'prototype', { value: {} })");
 
-// Verify that non-writability of other properties is respected.
-assertThrows("Object.defineProperty(f, 'name', { value: {} })");
+// Verify that non-configurability of other properties is respected, but
+// non-writability is ignored by Object.defineProperty().
+Object.defineProperty(f, 'name', { value: {} });
 assertThrows("Object.defineProperty(f, 'length', { value: {} })");
 assertThrows("Object.defineProperty(f, 'caller', { value: {} })");
 assertThrows("Object.defineProperty(f, 'arguments', { value: {} })");