[issue4715] optimize bytecode for conditional branches

[Jeffrey Yasskin]

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

I've updated Antoine's patch to incorporate my comments. This interacts
with issue 2459, but I haven't yet looked at its patch to figure out
how. As a first cut, I'll propose committing this patch, backporting it
to trunk, syncing it into the issue 2459 patch, and then committing that
patch. Let me know if that's crazy.

http://codereview.appspot.com/20064

Added file: http://bugs.python.org/file13170/condbranches-plus2.patch

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