[Relay][ONNX] fix #3134 converter where initializers were not registered as nodes (#3143)
[Relay][ONNX] fix #3134 converter where initializers were not registered as nodes (#3143)


tqchen/tvm,tqchen/tvm,Huyuwei/tvm,sxjscience/tvm,dmlc/tvm,tqchen/tvm,Laurawly/tvm-1,Huyuwei/tvm,dmlc/tvm,tqchen/tvm,Laurawly/tvm-1,tqchen/tvm,Laurawly/tvm-1,Laurawly/tvm-1,Huyuwei/tvm,Huyuwei/tvm,sxjscience/tvm,tqchen/tvm,Laurawly/tvm-1,tqchen/tvm,Laurawly/tvm-1,sxjscience/tvm,sxjscience/tvm,dmlc/tvm,dmlc/tvm,sxjscience/tvm,Huyuwei/tvm,sxjscience/tvm,Laurawly/tvm-1,sxjscience/tvm,Huyuwei/tvm,tqchen/tvm,dmlc/tvm,tqchen/tvm,Huyuwei/tvm,dmlc/tvm,tqchen/tvm,dmlc/tvm,sxjscience/tvm,dmlc/tvm,Laurawly/tvm-1,Laurawly/tvm-1,Huyuwei/tvm,dmlc/tvm,Huyuwei/tvm,sxjscience/tvm,Laurawly/tvm-1