Adds getter and setter in object literal support.

Test:

```js
console.log('1..3')

var a = {
	a: 5,
	get apple() {
		return 'ok';
	},
	set apple(value) {
		console.log(value);
	},
	c: 5
}

console.log(a.apple);
a.apple = 'ok'
console.log('ok');
```