Patch: Java: Fix missed GGC root registration

[Andrew Haley]

Bryce McKinlay writes:
 > Bryce McKinlay wrote:
 > 
 > > 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?
 > 
 > Actually, it turns out this is a tree-ssa specific bug - it applies only 
 > to mainline.

OK.

gcj-abi-2-dev-branch too, if you have a moment.

Andrew.