optimize flip op, removing duplicated computation when dim size is one #37825
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PR types
Performance optimization
PR changes
OPs
Describe
当dim size是1 的时候，paddle.flip性能比竞品性能低一倍，原因是当dim size 是1的时候，多执行一步pointwise kernel
现将这一步删掉，性能就可跟竞品打平。dim size > 1,性能正常
tensor shape 10000 x 10000
循环1000步，耗时对比：