Cherry-pick from 16498 : Deal with softmax layer in anakin subgraph#16611

Merged

Shixiaowei02 merged 2 commits intoPaddlePaddle:release/1.4from

Shixiaowei02:release/1.4

Apr 4, 2019

Commits on Apr 2, 2019

resolve conflicts with the develop branch test=release/1.4
Shixiaowei02
committed

Commits on Apr 3, 2019

update tensorrt subgraph_util test=release/1.4
Shixiaowei02
committed