[issue18408] Fixes crashes found by pyfailmalloc

[Roundup Robot]

Roundup Robot added the comment:

New changeset 3f25a7dd8346 by Victor Stinner in branch 'default':
Issue #18408: Fix list_ass_slice(), handle list_resize() failure
http://hg.python.org/cpython/rev/3f25a7dd8346

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