fix .zo output on 64-bit platform for fixnum constants that are 32-bit bignums
fix .zo output on 64-bit platform for fixnum constants that are 32-bit bignums

svn: r7103

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