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:

Revive tests in lib_test

Code cleaning

Merge pull request !3198 from yanghaoran/code_sync_0718

Merge pull request !3114 from riemann_penn/coo_tensor

Merge pull request !265 from yanghaoran/incubator

Merge pull request !2970 from panbingao/master

Merge pull request !2284 from BowenK/fix_depend

Merge pull request !1790 from lianliguang/remove-the-useless-transdata-connected-with-the-control-depend

Merge pull request !1868 from huanghui/insert-memcpy-async-pass