* add pad op

* add_some_code

* modify some code

* add some code

* add some code

* modify some code

* add some code

* modify some code

* Update composite_backward_api.h

* modify some code

* add some code

* add some code

* add some code

* support layer_norm prim and cinn test

* enable cinn test

* fix merge conflict

* polish input for check_output_with_place

* fix merge conflict

* add more test case

* fix merge conflict

* polish test case

* polish op_test

* change ln_g rules

* modify scale is none case

* modify scale is none case

* add public_python_api for check prim

* modify setoutputgrad and fp64bug

* add todo & delete log

* delete Single***varname

* delete get varname

* modify FP64 bug

* delete op test

* recover

* fix conflict

---------
Co-authored-by: NWeilong Wu <veyron_wu@163.com>

* add split_with_num composite rule

* add split_with_num composite rule

* add split composite rule

* update

* update test

* update test

* delete split_with_num_grad

* [cinn] concat_grad

* [cinn] concat_grad

* [cinn] concat_grad build success

* [Add PGLBOX] fix unnitest

* [Add PGLBOX] fix unnitest

* [Add PGLBOX] fix codestyle

* [cinn] update by comments

* [cinn] update by comment

* [cinn] add axis check

* support transpose and reshape

* support reshpe, transpose, cast vjp

* merge develop

* recover unused file

* remove prim base

* support problem

* remove additional status settting

* remove additional status settting

* fix ut

* fix ut

* fix ut

* fix no grad branch

* add more test

* disable fp16 in cpu

* fix test

* init commit

* fix tensor operator*

* fix compile bug

* bug reproduce

* update commit

* polish codes

* fix compile bug

* test begin

* test begin

* compile finish

* restore origin composite_backward_api

* pass local CI

* fix merge error

* fix merge error

* change py_test from GPU->CPU, test custom op

* polish codes, modify prim unittest

* modify prim unittest

* determine phi_tensor_operants location

* polish codes

* add header file

* solve windows unresolved symbol

* fix some CI error

* add overload defination

* fix CI inference and Windows

* polish codes according to reviewers' opinion

* polish codes according to reviewers' opinion

* use iwyu clean include, test=develop, test=win

* compilation error, test=develop

* fix compilation error2, test=develop

* fix compilation error3, test=develop

* fix compilation error4, test=develop

* fix compilation error5, test=develop

* fix compilation error6, test=develop

* fix compilation error7, test=develop

* fix compilation error8, test=develop

* fix compilation error8, test=develop

* fix compilation error10, test=develop

* fix compilation error11, test=develop

* modify the interface of Pass::Allay
test=develop

* Polish code
test=develop

* Fix Travis CI
test=develop

* fix Pass::Apply interface
test=develop

* Fix Travis CI
test=develop

and #pragma once in edited headers

add #include<string> in edited headers

test=develop

* link IR graph to analysis graph

* add clean code and update

* add infer_clean_pass

* add ir_pass_manager

* support fc fuse executation

* fix ir circle

Reduce one level of inheritence.

add doc

* Use Builder Chain to decorate new builders. It is easy to extend
  builders.
* Make graphviz path as a build strategy, not a FLAGS.

* cpplint test and add tesnor_py_test.cc

* Update

* Update