[issue18408] Fixes crashes found by pyfailmalloc

[Roundup Robot]

Roundup Robot added the comment:

New changeset 549cd815bf8d by Victor Stinner in branch 'default':
Issue #18408: Fix error handling in PyBytes_FromObject()
http://hg.python.org/cpython/rev/549cd815bf8d

New changeset 9d9371d4ff7b by Victor Stinner in branch 'default':
Issue #18408: Fix bytearrayiter.partition()/rpartition(), handle
http://hg.python.org/cpython/rev/9d9371d4ff7b

New changeset 20cd15a28ad3 by Victor Stinner in branch 'default':
Issue #18408: Fix _ctypes_alloc_format_string(), raise MemoryError on memory
http://hg.python.org/cpython/rev/20cd15a28ad3

New changeset 1386fb31c0ed by Victor Stinner in branch 'default':
Issue #18408: Fix PyCStructUnionType_update_stgdict(), handle
http://hg.python.org/cpython/rev/1386fb31c0ed

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