Update `is_floating_point` to handle bfloat16 (#7133)
Update `is_floating_point` to handle bfloat16 (#7133)

* Add div_ and is_floating_point operators

* Add handling of exprs to op, update tests

* Properly handle bfloat16 in is_floating_point

* Revert test changes

* revert whitespace changes
dmlc/tvm,Laurawly/tvm-1,dmlc/tvm,Laurawly/tvm-1,dmlc/tvm,dmlc/tvm,Laurawly/tvm-1,Laurawly/tvm-1,dmlc/tvm,dmlc/tvm,Laurawly/tvm-1,Laurawly/tvm-1,Laurawly/tvm-1,dmlc/tvm,Laurawly/tvm-1,Laurawly/tvm-1,Laurawly/tvm-1,dmlc/tvm,dmlc/tvm