[issue27945] Various segfaults with dict

[INADA Naoki]

INADA Naoki added the comment:

0001-Issue-27945-fix-dictitems_contains-use-after-free.patch

LGTM.
This patch can be applied to 2.7 and 3.5, without conflict against previous patch.
It passes `make quicktest`.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27945>
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