Nested rfactor fix, update predicates as well as source. (#3382)
Nested rfactor fix, update predicates as well as source. (#3382)

* Nested rfactor fix, update predicates as well as source.

* Linter

* Syntax fix.

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