[issue27703] Replace two Py_XDECREFs with Py_DECREFs in do_raise

[Xiang Zhang]

Changes by Xiang Zhang <angwerzx at 126.com>:


Added file: http://bugs.python.org/file44042/do_raise_v2.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27703>
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