Fix crash in astdiff and clean it up #14497
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Ref #14329
This fixes one of the crashes reported in the issue. In fact, using recursive type caught this crash statically, plus another subtle crash in
snapshot_optional_type(), without a single false positive (I was able to cleanly type also symbol table snapshots, but decided it is not worth the churn since we only ever compare them with==, supported by ~every Python object). I feel triumphant :-)