From: @huangbingjian
Reviewed-by: @hwhewei,@zh_qh
Signed-off-by: @zh_qh

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: @sl_wang
Reviewed-by: @wang_zi_dong
Signed-off-by:

From: @shibeiji
Reviewed-by: @c_34,@guoqi1024
Signed-off-by: @c_34

From: @liangzhibo
Reviewed-by: @ginfung,@zh_qh
Signed-off-by: @zh_qh

From: @VectorSL
Reviewed-by: @gaoxiong1,@c_34,@gaoxiong1
Signed-off-by: @c_34

Merge pull request !6267 from zhaoting/clean_warnings

Merge pull request !6358 from chenhaozhe/fix-loss-print

Merge pull request !6233 from yoonlee666/master

Merge pull request !6188 from chenhaozhe/fix-bert-loss-print