Supertypes for java source use incorrect generics

[juliamcclellan]

Sample java source:

class Bar<T> {}
public class Foo extends Bar<String> {}

The super class type of Foo should be Bar<String>, but the supertypes on the DClass for Foo instead includes the type Bar<T>, using the type parameter from the definition of Bar instead of the concrete type used in Foo's definition.

(This is handled correctly for kotlin source.)