Created by: luotao1

To improve the code (line+function) coverage, please add JIT CRF_decoding and Layer_norm unit-tests: http://ce.paddlepaddle.org:8080/viewLog.html?buildId=21110&buildTypeId=PaddlePaddleFramework_TestCoverage_TestCoverage&tab=report_project15_C___Coverage https://github.com/PaddlePaddle/Paddle/blob/c4b9eac11af34d340db876fae54d93aee427e5d6/paddle/fluid/operators/jit/test.cc#L760 @yihuaxu Could you add unit-tests for these two ops?