[issue28201] dict: perturb shift should be done when first conflict

[INADA Naoki]

Changes by INADA Naoki <songofacandy at gmail.com>:


Added file: http://bugs.python.org/file44981/dict-perturb-shift4.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28201>
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