[Prim] fix the stack op bug in the old IR #66457
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PR Category
Others
PR Types
Bug fixes
Description
当Tensor不开启梯度计算时，在旧IR下梯度初始化似乎不是初始化为空值，而是初始化成一个维度为[]的Tensor，这旧导致了其会进入到反向计算prim拆解的流程中，而其中涉及到了一个对梯度（维度为[]）reshape操作，这就导致了这个测试失败。因此需要在初始化变量时开启梯度计算