[issue11549] Rewrite peephole to work on AST

[Daniel Urban]

Daniel Urban <urban.dani+py at gmail.com> added the comment:

> not x == 2 can be theoretically optimized to x != 2, ...

I don't think it can:

>>> class X:
...     def __eq__(self, other):
...             return True
...     def __ne__(self, other):
...             return True
... 
>>> x = X()
>>> 
>>> not x == 2
False
>>> x != 2
True
>>>

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<http://bugs.python.org/issue11549>
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