* [Relay][Pass] Only allow Module -> Module for opts managed by pass infra

* revert gradient pass

* Support export ADT value in Python

* Cache original functions

* Cleanup

* Cleanup

* Add `set_body_simple` to Registry, refactor a lot of code to use it

* Add more types to Relay PackedFuncs

* Add Registry::set_body_method to easily make Node methods into
PackedFuncs

* Add set_body_method, set_body_node_method; start typing api_lang

* Add some docs, remove unused script

* Fix mysterious linter problem

* Touch up api_ir.cc

* Fix some issues with TOPI argument counts

* Revert changes to topi.cc to avoid problems with optional arguments

* A little more cleanup

* Type more of the api _ functions

* Whitespace

* Finalize names and docs for new registry helpers

* Update docs

* [HEADER] ASF header dir=include

* [HEADER] ASF Header dir=src

* [HEADER] ASF Header -dir=python

* [HEADER] ASF header dir=topi

* [HEADER] ASF Header dir=nnvm

* [HEADER] ASF Header -dir=tutorials

* [HEADER] ASF Header dir=tests

* [HEADER] ASF Header -dir=docker

* fix whitespace

* [HEADER] ASF Header -dir=jvm

* [HEADER] ASF Header -dir=web

* [HEADER] ASF Header --dir=apps

* [HEADER] ASF Header --dir=vta

* [HEADER] ASF Header -dir=go

* temp

* [HEADER] ASF Header --dir=rust

* [HEADER] Add ASF Header --dir=cmake

* [HEADER] ASF Header --dir=docs

* [HEADER] Header for Jenkinsfile

* [HEADER] ASF Header to toml and md

* [HEADER] ASF Header to gradle

* Finalize rat cleanup

* Fix permission

* Fix java test

* temporary remove nnvm onnx test

* initial commit

* add python frontend and module tests

* add unit tests for function pass and optimize interface

* add ExprPass

* remove PassState and pass context for run

* add required_passes

* return module

* remove move

* fix minor reviews

* remove optimizer, optimizer->pass_manager, make pass a the base class of all

* remove deleted files

* move resolvedependency to sequential pass, use ir_pass namespace

* add todo

* add disabled passes in sequetialpass

* fix minor

* fix currying doc

* remove pass_kind from passnode

* remove pass kind from test

* fix doc

* fix per @tqchen's comments

* remove pass_manager.py create separate classes

* simplify pass_func

* inline using passfunc

* update doc

* disable test_quantize_pass for now

* create PassInfo class to contain the meta data

* flatten passinfo for interface

* retrigger ci

* remove required method

* make Pass python class lighter

* create pass -> decorator

* make the api consistent for all classes