Add subgraph fuse support and anakin engine#16018

Merged

NHZlX merged 4 commits intoPaddlePaddle:feature/anakin-enginefrom

NHZlX:anakin_subgraph_dev

Mar 6, 2019

Commits on Mar 1, 2019

1. add subgraph and trt engine
NHZlX
committed

Commits on Mar 2, 2019

update engine interface
NHZlX
committed

Commits on Mar 5, 2019