1. support single name
2. add hash method for pair
3. move constructor and destructor of MemAddressInfo as public
4. remove graph_id
5. modify interval for somas info

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

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)
```

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

From: @liu_xiao_93
Reviewed-by: 
Signed-off-by:

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

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