fix: 虚拟列表使用错误的itemRenderer #412
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当使用eui.ItemRenderer时会给ItemRenderer赋值$hashCode，之后使用其他继承于eui.ItemRenderer的其他ItemRenderer就会直接读取到eui.ItemRenderer的$hashCode，而无法创建新的$hashCode；
最终导致：当虚拟列表使用两个不同的renderer时，由于他们的$hashCode是一样的，所以执行createVirtualRenderer方法时会取之前缓存的renderer，最终所有Item都是同一个renderer