[issue18408] Fixes crashes found by pyfailmalloc

[STINNER Victor]

STINNER Victor added the comment:

misc_fixes.patch: Misc bugfixes related to MemoryError, this patch should be read carefully. The changes in unicodeobject.c may be written differently. I wrote them to fix a failing assertion ("assert(data != NULL);") in _PyUnicode_CheckConsistency(), called when the creation of a new string failed.

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Added file: http://bugs.python.org/file30869/misc_fixes.patch

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