[issue18408] Fixes crashes found by pyfailmalloc

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2e42c0a39321 by Victor Stinner in branch 'default':
Issue #18408: Fix _Py_DisplaySourceLine()
http://hg.python.org/cpython/rev/2e42c0a39321

New changeset 92a9ccb2a521 by Victor Stinner in branch 'default':
Issue #18408: add more assertions on PyErr_Occurred() in ceval.c to detect bugs
http://hg.python.org/cpython/rev/92a9ccb2a521

New changeset 9213313b1a6f by Victor Stinner in branch 'default':
Issue #18408: Fix show_warning(), clear also the exception raised by
http://hg.python.org/cpython/rev/9213313b1a6f

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