[issue20440] Use Py_REPLACE/Py_XREPLACE macros

[Tal Einat]

Tal Einat added the comment:

PY_ASSIGN_AND_DECREF could seem to imply that the assigned value is DECREF-ed. I think PY_DECREF_AND_ASSIGN makes it clearer that the original value is DECREF-ed.

I like PY_ASSIGN_NULL_AND_DECREF, though for the same reason as above, I'd name it PY_DECREF_AND_ASSIGN_NULL.

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<http://bugs.python.org/issue20440>
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