[issue19835] Add a MemoryError singleton to fix an unlimited loop when the memory is exhausted

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Under very low memory condition, PyErr_NoMemory() or
> PyErr_NormalizeException() enters an unlimited loop when the free list 
> of MemoryError becomes empty.

The real question is why the free list becomes empty.

Either way, I don't think a read-only singleton is a good idea. It may be simpler to call Py_FatalError in such cases.

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nosy: +neologix

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