Fix for Issue #68 (cub::TilePrefixCallbackOp::WarpReduce doesn't permit ptx arch specialization)
Fix for Issue #68 (cub::TilePrefixCallbackOp::WarpReduce doesn't permit
ptx arch specialization)

https://github.com/NVlabs/cub/issues/68

Former-commit-id: bfc177b9c1906801a73c1d772b49e21b7277a51c
NVlabs/CUB,NVlabs/cub,NVIDIA/cub