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)
```

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

From: @lichen666
Reviewed-by: @zh_qh
Signed-off-by:

From: @gong_zi_yan
Reviewed-by: @stsuteng,@yangzhenzhang,@kisnwang
Signed-off-by: @stsuteng,@kisnwang

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

Merge pull request !7818 from yangzhenzhang/add-recursion-limit

Merge pull request !7805 from yihuaijie/master

Merge pull request !6673 from huangxinjing/stage_strategy

Merge pull request !6409 from gziyan/batch_paralell_black_list