Fix roll kernel gpu bug.

[FeixLiu]

PR types

Others

PR changes

Others

Describe

Fix gpu roll kernel.

import paddle
x = paddle.to_tensor([[1, 2, 3], [4, 5, 6]])
y = paddle.roll(x, shifts=[1, 1], axis=[1, 1])

Before this pr, the behavior of this sample code is undefined. This pr fix this problem.

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