[issue27987] obmalloc's 8-byte alignment causes undefined behavior

[Antoine Pitrou]

Change by Antoine Pitrou <pitrou at free.fr>:


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versions:  -Python 2.7, Python 3.3, Python 3.4, Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue27987>
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