[issue43916] Check that new heap types cannot be created uninitialised: add Py_TPFLAGS_DISALLOW_INSTANTIATION type flag

[Erlend E. Aasland]

Change by Erlend E. Aasland <erlend.aasland at innova.no>:


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title: Mark static types newly converted to heap types as immutable: add Py_TPFLAGS_DISALLOW_INSTANTIATION type flag -> Check that new heap types cannot be created uninitialised: add Py_TPFLAGS_DISALLOW_INSTANTIATION type flag

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43916>
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