[issue18408] Fixes crashes found by pyfailmalloc

[STINNER Victor]

STINNER Victor added the comment:

TODO:

- review and integrate frame_fasttolocals.patch
- #18507: import_init() should not use Py_FatalError() but return an error
- #18509: CJK decoders should return MBERR_EXCEPTION on PyUnicodeWriter error
- fix tests hang when an exception occurs in a thread

Most bugs have been fixed.

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