[issue2459] speedup loops with better bytecode

[Neal Norwitz]

Neal Norwitz <nnorwitz at gmail.com> added the comment:

Antoine, I hope to look at this patch eventually.  Unfortunately, there
are too many build/test problems that need to be resolved before the
next release.  If you can help out with those, I will be able to review
this patch sooner.

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nosy: +nnorwitz

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