[issue27660] Replace size_t with Py_ssize_t as the type of local variable in list_resize

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Unsigned type can be used for more efficient checking on integer overflow.

    new_allocated = (newsize >> 3) + (newsize < 9 ? 3 : 6);
    new_allocated += (size_t)newsize;
    if (new_allocated < (size_t)newsize) {
        PyErr_NoMemory();
        return -1;
    }

Checking "new_allocated < (size_t)newsize" can be more efficient than 
"new_allocated > PY_SSIZE_T_MAX - newsize".

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<http://bugs.python.org/issue27660>
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