Fix div error when dtype is int64 in static mode

[0x45f]

PR types

Bug fixes

PR changes

APIs

Description

下面代码动态图返回结果是0.75，动转静(静态图)返回结果是0。正确结果应该是0.75，因为这里的除法是truediv。

import paddle

@paddle.jit.to_static
def fn(x, y):
    z = x / y
    return z

x = paddle.to_tensor([3], dtype='int64')
y = paddle.to_tensor([4], dtype='int64')

out = fn(x, y)
print(out)

动态图的代码中将类型统一转成了float32类型，所以计算结果正确

但是静态图variable的__truediv__方法中没有对应类型转换的代码，本PR的修改参考了老动态图varbase的truediv的代码

PCard-64703

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[Aurelius84]

LGTM

[2742195759]

LGTM

[SigureMo]

LGTM~~~