Patch: Java: Fix missed GGC root registration

[Bryce McKinlay]

The struct binding_level in java/decl.c lacked ggc type/root 
registration markers. This resulted in occasional tree corruption bugs 
when compiling bytecode using the gcj-abi branch because the 
current_binding_level->stmts could be freed by the GC when compiling 
some class files.

This patch adds the appropriate markers and roots registration.

OK for mainline and 3.4 branch?

Bryce

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