[PATCH INSTALLED]: delete some const shadow functions

[Tom Tromey]

>>>>> "Gaby" == Gabriel Dos Reis <gdr@cs.tamu.edu> writes:

Gaby> I did not pursue this path further, as I had private conversations
Gaby> with fellow front-ends maintainers and it was a "no go" option.  But,
Gaby> the world has changed since then, so this is a good time to do that.

Gaby> Do we just build a flat enumeration, or do we insist on the
Gaby> xxx_last_tree_code markers for each configured language xxx?

gcj doesn't appear to use LAST_JAVA_TREE_CODE.  If the other languages
also do not, I think removing them is fine.

FWIW I think I can remove all the remaining gcj-specific tree codes.
I'll do that soon-ish

Tom