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Memory Allocation with mmap

# SYS_MMAP, PROT_*, MAP_* constants are provided by the x86_64 backend

let alloc = (size:int):>int => {
    return __syscall6__(SYS_MMAP 0 size (PROT_READ or PROT_WRITE) (MAP_PRIVATE or MAP_ANONYMOUS) (0 - 1) 0)
}

let main = ():>int => {
    let buffer:int = alloc(4096)
    __store__(42 buffer)
    return __load__(buffer)  # returns 42
}