[issue18408] Fixes crashes found by pyfailmalloc

[Roundup Robot]

Roundup Robot added the comment:

New changeset 89c6495d1ff2 by Victor Stinner in branch 'default':
Issue #18408: Fix parser.sequence2st() and parser.tuple2st(): raise MemoryError
http://hg.python.org/cpython/rev/89c6495d1ff2

New changeset c80a9705803a by Victor Stinner in branch 'default':
Issue #18408: parser module: fix error handling in node2tuple()
http://hg.python.org/cpython/rev/c80a9705803a

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<http://bugs.python.org/issue18408>
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