Support seq len equal to 0 in sequence ops (#16964)
* Merge conflicts with 1.4 * Resolve conflicts * Fix some comments test=release/1.4 * Fix py3 error test=release/1.4
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Fork自 PaddlePaddle / Paddle
* Merge conflicts with 1.4 * Resolve conflicts * Fix some comments test=release/1.4 * Fix py3 error test=release/1.4