ClassInitializationDeadlock: improve handling of classes that can't be initialized outside the current compilation unit #4331
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ClassInitializationDeadlock: improve handling of classes that can't be initialized outside the current compilation unit
Consider all classes in the super type hierarchy between the subclass and containing superclass, to catch deadlocks where an intermediate supertype can be instantiated.
This also fixes an NPE with an existing check for the direct super type.
#2062