Extending gcjx visitor pattern

[Tom Tromey]

>>>>> "Mike" == Mike Emmel <mike.emmel@gmail.com> writes:

Mike> Your probably right it does not seem that bad just its different.
Mike> I'll learn a bit more but I felt it would be nice to comment on a few
Mike> things as I saw them then
Mike> to later forget.

Yeah, by all means bring stuff up.
gcjx can definitely use more eyes on it.  And, while I tried to make
it easy to add new back ends, I'm sure we can improve on this.

Tom