[issue18408] Fixes crashes found by pyfailmalloc

[Roundup Robot]

Roundup Robot added the comment:

New changeset 39eb1ce5f377 by Victor Stinner in branch 'default':
Issue #18408: ste_new() initialize all attributes before handling error
http://hg.python.org/cpython/rev/39eb1ce5f377

New changeset aaa6e8b8a5c9 by Victor Stinner in branch 'default':
Issue #18408: Fix compiler_import() to handle PyUnicode_Substring() failure properly
http://hg.python.org/cpython/rev/aaa6e8b8a5c9

New changeset ff93930a53c0 by Victor Stinner in branch 'default':
Issue #18408: parsetok() must not write into stderr on memory allocation error
http://hg.python.org/cpython/rev/ff93930a53c0

New changeset 1a1869baec4c by Victor Stinner in branch 'default':
Issue #18408: Fix _Pickler_New() and _Unpickler_New(): initialize all
http://hg.python.org/cpython/rev/1a1869baec4c

New changeset e11121b9bd09 by Victor Stinner in branch 'default':
Issue #18408: _elementtree.c now handles create_extra() failure
http://hg.python.org/cpython/rev/e11121b9bd09

New changeset 0877e17fa25e by Victor Stinner in branch 'default':
Issue #18408: Different fixes in _elementtree.c to handle correctly MemoryError
http://hg.python.org/cpython/rev/0877e17fa25e

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