Respect original statement order

see more details in https://github.com/zhongjiajie/stmdency#usage, the output statement order is different from the original, we should keep the same,

diff between original to result

```diff
a = 1
- b = 2

def bar():
   b = a + 3
   print(a, b)

+ b = 2
+ 
def foo():
   bar(b)
```