[issue1621] Do not assume signed integer overflow behavior

[Martin Panter]

Martin Panter added the comment:

Xiang: regarding your overflow_fix_in_listextend.patch, what do you think about adding a comment or debugging assertion instead, something like:

/* It should not be possible to allocate a list large enough to cause an overflow on any relevant platform */
assert(m < PY_SSIZE_T_MAX - n);

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<http://bugs.python.org/issue1621>
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