Fix for Issue #71 (KeyVairPair won't work if Key has non-trivial ctor)
Fix for Issue #71 (KeyVairPair won't work if Key has non-trivial ctor)

https://github.com/NVlabs/cub/issues/71
Former-commit-id: 005b11045803b4bb64731d6719c1e15a6d1794f3
NVIDIA/cub,NVlabs/cub,NVlabs/CUB