[issue8692] Use divide-and-conquer for faster factorials

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

New patch (factorial3.patch) addressing all of Alexander's points except the one about including Python source somewhere.

I also expanded the lookup table to 20 entries on LP64 systems.

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Added file: http://bugs.python.org/file17351/factorial3.patch

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