[issue18005] faster modular exponentiation in some cases

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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nosy: +eric.smith, lemburg, mark.dickinson, rhettinger, serhiy.storchaka, stutzbach
versions: +Python 3.4 -Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18005>
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