* refine code

* delete some unused code

* refine code of build

* refine code of build

* add block

* refine builder

* refine code

* refine code by comment

* fix compiler bug

* refine op dyn_cast

* fix bug

* refine code

* refine code

* refine code

* refine code

* add OpTrait OpInterface ValueIterator TypeList

* refine code

* refine code

* refine code

* add opinfo

* add typeid copy constructor

* add trait interface construct method for opinfo_impl

* add trait interface construct method for opinfo_impl

* add trait interface construct method for opinfo_impl

* add trait interface construct method for opinfo_impl

* add trait interface construct method for opinfo_impl

* add create

* add member func for opinfo

* fix compile bug

* add op interface in ircontext

* fix compile bug

* fix compile bug

* refine code

* fix compile bug

* add ut

* refine ut

* refine code of opinfo_impl

* delete unused code

* add dyncast for operation

* refine comment

* refine opinfo_impl

* delete unused code

* refine code by comment

* refine code

* refine code

* refine code for registerOp

* refine opfin create

* refine code of search method of ircontext

* refine op attribute

* change opinfo_map key from type_id to string

* add Value OpResult OpOperand class

* add Value OpResult OpOperand class

* fix bug

* fix bug

* add utils

* refine code

* add ptr offset and reset method

* add value impl

* fix bug

* refine comment of ValueImpl

* refine code of OpResult

* refine code of Value

* add some comment

* fix cpu compile bug

* refine code

* add op

* add method for op & test value

* refine unittest

* refine code by comment

* refine code

* refine code

* refine code

* refine code

* add trt_support_nhwc_pass

* 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

* Update tensor_util.h

* Update with moved TensorDesc

* Fix tensur_utils.cu

* Update

* Update

* Update

* Update

* Make tensor_util.cu a symbolic link