Win64: fix JIT floating-point constant
Win64: fix JIT floating-point constant

Repairs commit 71591a62a4 for Win64, where `long` != `intptr_t`

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