[issue1692335] Fix exception pickling: Move initial args assignment to BaseException.__new__

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Or you could simply Py_INCREF(args) before the Py_XDECREF...

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1692335>
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