[issue43973] Use Py_TPFLAGS_IMMUTABLETYPE in __class__ assignments check

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:


New changeset b73b5fb9ea08156991a065c1696e8d8cf7622482 by Erlend Egeberg Aasland in branch 'master':
 bpo-43973: object_set_class() checks Py_TPFLAGS_IMMUTABLETYPE (GH-25714)
https://github.com/python/cpython/commit/b73b5fb9ea08156991a065c1696e8d8cf7622482


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<https://bugs.python.org/issue43973>
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