Java: Fix PR 1262

[Bryce McKinlay]

This patch fixes PR 1262. GCJ would incorrectly override "invisible" 
package-private methods from a superclass in another package. The patch 
recognizes this case and assigns a new vtable entry for the new method. 
There is also some code cleanup/reorganization - a couple of static 
methods moved from parse.y and made extern, and "breakdown_qualified" is 
renamed to the clearer "split_qualified_name".

The runtime has the same bug and will require a similar patch to handle 
bytecode and --indirect-dispatch classes.

No regressions. OK to commit?

Bryce


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