[issue16398] deque.rotate() could be much faster

[Serhiy Storchaka]

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


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components: +Extension Modules -Library (Lib)
stage:  -> needs patch
versions: +Python 3.4 -Python 2.7, Python 3.2, Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16398>
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