Fix quantization hang bugs.#16456

Merged

wzzju merged 3 commits intoPaddlePaddle:developfrom

wzzju:fix_quan_hang

Mar 27, 2019

Commits on Mar 25, 2019

Fix some bugs for quantization passes.
wzzju
committed

Commits on Mar 26, 2019

Use the resolve hazard method.
wzzju
committed
Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into fix_quan_hang
wzzju
committed