Add a multi-dim add layer test.
Add a multi-dim add layer test.

We need to figure out if tensorrt
use row-major or col-major for tensor
layerout inorder to do conversion.

jacquesqiao/Paddle,reyoung/Paddle,QiJune/Paddle,tensor-tang/Paddle,baidu/Paddle,PaddlePaddle/Paddle,luotao1/Paddle,Canpio/Paddle,putcn/Paddle,jacquesqiao/Paddle,reyoung/Paddle,jacquesqiao/Paddle,tensor-tang/Paddle,Canpio/Paddle,PaddlePaddle/Paddle,chengduoZH/Paddle,jacquesqiao/Paddle,luotao1/Paddle,luotao1/Paddle,QiJune/Paddle,luotao1/Paddle,putcn/Paddle,putcn/Paddle,putcn/Paddle,baidu/Paddle,baidu/Paddle,Canpio/Paddle,baidu/Paddle,luotao1/Paddle,baidu/Paddle,PaddlePaddle/Paddle,Canpio/Paddle,tensor-tang/Paddle,tensor-tang/Paddle,reyoung/Paddle,chengduoZH/Paddle,pkuyym/Paddle,QiJune/Paddle,PaddlePaddle/Paddle,jacquesqiao/Paddle,chengduoZH/Paddle,Canpio/Paddle,QiJune/Paddle,tensor-tang/Paddle,putcn/Paddle,QiJune/Paddle,reyoung/Paddle,PaddlePaddle/Paddle,reyoung/Paddle,luotao1/Paddle,QiJune/Paddle,putcn/Paddle,jacquesqiao/Paddle,pkuyym/Paddle,pkuyym/Paddle,pkuyym/Paddle,reyoung/Paddle,chengduoZH/Paddle,pkuyym/Paddle,Canpio/Paddle,Canpio/Paddle,PaddlePaddle/Paddle,PaddlePaddle/Paddle,luotao1/Paddle,chengduoZH/Paddle,Canpio/Paddle,pkuyym/Paddle