[issue16096] Get rid of dangerous integer overflow tricks

[Roundup Robot]

Roundup Robot added the comment:

New changeset 906ae6485cb8 by Mark Dickinson in branch '3.3':
Issue #16096: Fix signed overflow in Objects/longobject.c.  Thanks Serhiy Storchaka.
http://hg.python.org/cpython/rev/906ae6485cb8

New changeset b728aac3bdb3 by Mark Dickinson in branch 'default':
Issue #16096: port fix from 3.3
http://hg.python.org/cpython/rev/b728aac3bdb3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16096>
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