Function all_sync

src/backend/cuda/kernel/shfl_intrinsics.hpp:18–24

//__all_sync wrapper
template<typename T>
__device__ T all_sync(T var) {
#if (CUDA_VERSION >= 9000)
    return __all_sync(FULL_MASK, var);
#else
    return __all(var);
#endif
}

//__all_sync wrapper
template<typename T>