[issue4896] Faster why variable manipulation in ceval.c

[Paolo 'Blaisorblade' Giarrusso]

Changes by Paolo 'Blaisorblade' Giarrusso <p.giarrusso at gmail.com>:


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nosy: +blaisorblade

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4896>
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