[issue18408] Fixes crashes found by pyfailmalloc

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7b81a535ad14 by Victor Stinner in branch 'default':
Issue #18408: Fix structseq_reduce(), handle PyDict_SetItemString() failure
http://hg.python.org/cpython/rev/7b81a535ad14

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18408>
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