[issue27703] Replace two Py_XDECREFs with Py_DECREFs in do_raise

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

do_raise_v2.patch (with asserts) LGTM. There are two ways that lead to this point (and third way leads to raising an exception), and additional assertions make the code clearer, because a reader shouldn't follow all these patch for reading the code after assertions.

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