From: @yanghaitao1
Reviewed-by: @yelihua
Signed-off-by:

From: @HulkTang
Reviewed-by: @zhoufeng54,@jjfeing
Signed-off-by: @jjfeing

From: @liubuyu
Reviewed-by: 
Signed-off-by:

From: @zhoufeng54
Reviewed-by: @kisnwang,@xu-yfei
Signed-off-by: @xu-yfei

From: @zpac
Reviewed-by: @cristoval,@wilfchen
Signed-off-by: @cristoval

From: @HulkTang
Reviewed-by: @kisnwang,@chujinjin
Signed-off-by: @chujinjin

From: @zuochuanyong
Reviewed-by: @jjfeing,@chujinjin
Signed-off-by: @jjfeing

From: @lianliguang
Reviewed-by: 
Signed-off-by:

Signed-off-by: zhoufeng <zhoufeng54@huawei.com>

From: @wenfangpei
Reviewed-by: 
Signed-off-by:

From: @chuckchen521
Reviewed-by: 
Signed-off-by:

From: @liujunzhu
Reviewed-by: @zhoufeng54,@guoqi1024
Signed-off-by: @guoqi1024

From: @jojobugfree
Reviewed-by: 
Signed-off-by:

From: @liujunzhu
Reviewed-by: 
Signed-off-by:

1. add trigger point
2. reduce unuse import
3. modify GetRealFilePath

From: @jojobugfree
Reviewed-by: 
Signed-off-by:

From: @yuchaojie
Reviewed-by: @kisnwang
Signed-off-by:

From: @louie5
Reviewed-by: 
Signed-off-by:

From: @liubuyu
Reviewed-by: 
Signed-off-by:

From: @wilfchen
Reviewed-by: @cristoval,@limingqi107
Signed-off-by: @limingqi107

From: @louie5
Reviewed-by: 
Signed-off-by:

From: @zhupuxu
Reviewed-by: @jjfeing,@zhoufeng54
Signed-off-by: @zhoufeng54

Signed-off-by: zhupuxu <zhupuxu@huawei.com>

From: @zuochuanyong
Reviewed-by: 
Signed-off-by:

1. add ExecNode and StreamRxecOrderRecorer
2. add json format and json dump for stream exec order
3. add stream exec order api
4. add in CMakeLists

1. add validation for directory and filename
2. refactor the file operations about path
3. add in CMakeLists
4. add logger in nn_ops

The basic idea is: exploits data dependency to control the execution order
of side-effect operations, and keep the semantics of ANF unchanged.

The ControlDepend primitive is removed and there are two primitives added:

1. UpdateState:
```
  a = Assign(para, value)
```
became:
```
  a = Assign(para, value, u)
  u = UpdateState(u, a)
```

2. Load:
```
  x = Add(para, value)
```
became:
```
  p = Load(para, u)
  x = Add(p, value)
  u = UpdateState(u, p)
```