MEM_FIXED_SIZE
ARG_PTR_TO_FIXED_SIZE_MEM = MEM_FIXED_SIZE | ARG_PTR_TO_MEM,
if (arg_type & MEM_FIXED_SIZE) {
bool is_fixed = fn->arg_type[arg] & MEM_FIXED_SIZE;
!(fn->arg_type[i] & MEM_FIXED_SIZE)))