[Beignet] [PATCH] Add long support for printf

[Zhigang Gong]

Another comment as below:
> +                arg = builder->CreateIntCast(arg, Type::getInt64Ty(module->getContext()), sign);
> +              }
> +              dst_type = Type::getInt64PtrTy(module->getContext(), 1);
> +              sizeof_size = sizeof(ulong);
even using unsigned long at the above code is incorrect, please use int64_t instead.
unsigned long is 32 bit in 32bit linux system.

> +            } else {
> +              /* If the bits change, we need to consider the signed. */
> +              if (arg->getType() != Type::getInt32Ty(module->getContext())) {
> +                arg = builder->CreateIntCast(arg, Type::getInt32Ty(module->getContext()), sign);
> +              }
>