ES6: Implement Object.setPrototypeOf

test/webkit/Object-create-expected.txt

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 Test to ensure correct behaviour of Object.defineProperties
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-PASS Object.create() threw exception TypeError: Object prototype may only be an Object or null.
-PASS Object.create('a string') threw exception TypeError: Object prototype may only be an Object or null.
+PASS Object.create() threw exception TypeError: Object prototype may only be an Object or null: undefined.
+PASS Object.create('a string') threw exception TypeError: Object prototype may only be an Object or null: a string.
 PASS Object.create({}, 'a string') threw exception TypeError: Property description must be an object: a.
 PASS Object.create(null, 'a string') threw exception TypeError: Property description must be an object: a.
 PASS JSON.stringify(Object.create(null,{property:{value:'foo', enumerable:true}, property2:{value:'foo', enumerable:true}})) is '{"property":"foo","property2":"foo"}'
 PASS JSON.stringify(Object.create({},{property:{value:'foo', enumerable:true}, property2:{value:'foo', enumerable:true}})) is '{"property":"foo","property2":"foo"}'
 PASS JSON.stringify(Object.create({},{property:{value:'foo'}, property2:{value:'foo', enumerable:true}})) is '{"property2":"foo"}'
 PASS JSON.stringify(Object.create(null,{property:{value:'foo'}, property2:{value:'foo', enumerable:true}})) is '{"property2":"foo"}'
 PASS Object.getPrototypeOf(Object.create(Array.prototype)) is Array.prototype
 PASS Object.getPrototypeOf(Object.create(null)) is null
 PASS Object.create(null, DescriptorWithValueGetter).foo is true
 PASS Object.create(null, DescriptorWithEnumerableGetter).foo is true
 PASS Object.create(null, DescriptorWithConfigurableGetter).foo is true
 PASS Object.create(null, DescriptorWithWritableGetter).foo is true
 PASS Object.create(null, DescriptorWithGetGetter).foo is true
 PASS Object.create(null, DescriptorWithSetGetter).foo is true
 PASS successfullyParsed is true
 
 TEST COMPLETE