Sherry-Zhang commented on issue #10104: [WIP][MXNET-107] Fused RNN 
implementation for CPU
   I have finished the fused implementation for LSTM. Multi-layer and 
bidirectional support for it has also been added. When refactoring cudnn 
registration with nnvm interfaces, a segfault is observed in ci environment. We 
cannot reproduce the error on our local server. But seems it is caused by the 
memory sharing mechanism between forward and backward computation. So we 
removed nnvm interfaces from this PR and keep both cpu path and gpu path with 
legacy registration method. Performance table has been updated. @szha , 
@piiswrong , @Jerryzcn , @cjolivier01 , @marcoabreu , @pengzhao-intel , @TaoLv  
can you help to review this PR?  Any comments are welcome. 

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