[issue4258] Use 30-bit digits instead of 15-bit digits for Python integers.

[Antoine Pitrou]

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

As I said, I actually see a speedup as well on a 32-bit build on a
64-bit CPU. So the current patch (30bit_longdigit13.patch) is fine.

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<http://bugs.python.org/issue4258>
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