[issue27725] Use Py_SIZE(x) instead of x->ob_size

[STINNER Victor]

STINNER Victor added the comment:

> However, compiling ONLY the file Objects/longobject.c with -qalias=noansi did fix the issue on AIX. That could be the same on Linux.

Nobody asked to only set the compiler file to only this file.

As we said, the issue is sprayed in all the C code base. The whole Python 2 project has aliasing issues. Extension modules have same the issue.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27725>
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