8016218: Warnings building corba repo due to missing hashCode methods

[Alan Bateman]

The warnings from the build of the corba repository on missing hashCode 
methods have been annoying me for some time. I was hoping they would 
annoy others too but looks like I blinked first :-)

Here's the webrev with the changes that I'd like to push to fix the issues:

http://cr.openjdk.java.net/~alanb/8016218/webrev/

Note that there are 3 real issues but they are obvious. I'm running the 
CORBA tests to make sure that it doesn't break anything. Note that the 
bulk of the warnings were coming from ParserTable but they turn out not 
to be interesting because they are only used in the testing framework.

-Alan.