[issue4715] optimize bytecode for conditional branches

[Jeffrey Yasskin]

Jeffrey Yasskin <jyasskin at gmail.com> added the comment:

Oh, and no problem with picking up the patches. Thanks for writing them
in the first place.

Here's the backport to trunk. I particularly enjoyed the bit in
pyassem.py where I had to teach the pure-Python compiler that you can
get to a block without going through a relative jump or a fallthrough.

The patch is also #2 at http://codereview.appspot.com/20064.

I'll post performance numbers as soon as I've measured them.

Added file: http://bugs.python.org/file13182/trunk-opt-cond-jump.patch

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