[issue2459] speedup for / while / if with better bytecode

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> I've updated for_iter.patch to the latest trunk, merging in issue 4715.
> I also changed tracing a bit so that the first line of a loop doesn't
> get traced twice in the first iteration, and added to test_dis to check
> that decreasing line numbers work there.

Thanks a lot!

By the way, why do you bench cPickle? Does your test call Python code
significantly?

Overall, the results look positive although not overwhelming.

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