[3.8] bpo-37169: Rewrite _PyObject_IsFreed() unit tests (GH-13888)#13895
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Replace two Python function calls with a single one to ensure that no
memory allocation is done between the invalid object is created and
when _PyObject_IsFreed() is called.
(cherry picked from commit 3bf0f3a)
https://bugs.python.org/issue37169