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: @wangnan39
Reviewed-by: 
Signed-off-by:

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

From: @irmo
Reviewed-by: @kisnwang,@zhoufeng54
Signed-off-by: @zhoufeng54

From: @yuchaojie
Reviewed-by: @kingxian,@zhoufeng54
Signed-off-by: @kingxian

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

From: @yanghaitao1
Reviewed-by: @wangyue01,@lilongfei15
Signed-off-by: @lilongfei15

From: @jojobugfree
Reviewed-by: @kisnwang,@zhoufeng54,@chujinjin
Signed-off-by: @chujinjin

sparse loss

format

add string head

context

From: @looop5
Reviewed-by: @lingyunli63,@ckey_dou,@gaoxiong1
Signed-off-by: @ckey_dou

From: @liangzelang
Reviewed-by: @zhoufeng54,@kisnwang
Signed-off-by: @kisnwang

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

From: @jiangzg001
Reviewed-by: @kingxian,@c_34,@kingxian
Signed-off-by: @c_34

format

format

format

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

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

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