* [REFACTOR/PASS] Formalize argument bind and match util

* grammar

* [LANG] CommReducer

* Reorganize c_api

* Remove InitValue and Combine; refactor Functor

* Make CommReducer an Expr

* Make comm_reducer type independent

* Make CommReducerNode a Node

* Small fix

* Refine

* Refine front api; add integration testcases for min/max

* Fix python

* Refine

* Fix lint and add example

* [CODEGEN] Refactor common codegen, Verilog Codegen

* fix make

* fix mk

* update enable signal

* change function name to at neg edge

* Move test to correct place

* [CODEGEN] Add LoweredFunc, MakeAPI and SplitHostDevice

* update halideir