[issue12080] decimal.py: performance in _power_exact

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset 78d79499e7de by Mark Dickinson in branch '2.7':
Issue #12080: Fix a performance issue in Decimal._power_exact that caused some corner-case Decimal.__pow__ calls to take an unreasonably long time.
http://hg.python.org/cpython/rev/78d79499e7de

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<http://bugs.python.org/issue12080>
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