fix x86_64 JIT bug: branching on an immediate comparsion where the immediate value does not fit in 32 bits
fix x86_64 JIT bug: branching on an immediate comparsion where the immediate value does not fit in 32 bits

svn: r7022

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket