[gcjx] Make model_element abstract and expand visitor interface

[Ranjit Mathew]

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Hi,

  Now that the kludgy use of model_element in the parser is gone,
I made model_element::visit() abstract, removed its implementation
from model/element.cc and expanded the visitor interface to cover
the model elements that need it now.

Once again, I have only tried to cover as many model elements as
was needed to cleanly compile stuff and there still might be
model elements that escape the clutches of the visitor interface.
All the implementations are dummy for the moment. I will separately
flesh out the new pretty-printer methods.

There are two patches - one for "gcjx" and another for "gcc/java".

OK?

Thanks,
Ranjit.

- --
Ranjit Mathew       Email: rmathew AT gmail DOT com

Bangalore, INDIA.     Web: http://ranjitmathew.hostingzero.com/




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