Reduce adding RETURN_END_IF in 3.5+
Reduce adding RETURN_END_IF in 3.5+

The whole control flow determination has to be redone in a less
haphazard way using real flow-control analysis. Hopefully that's on the
way.

In the meantime we have this hack.

moagstar/python-uncompyle6,moagstar/python-uncompyle6