Test scan_by_key algorithms with thrust::seq in __device__ code.
Test scan_by_key algorithms with thrust::seq in __device__ code.

raygit/thrust,thvasilo/thrust,zhenglaizhang/thrust,thrust/thrust,arnabgho/thrust,xiongzhanblake/thrust,thrust/thrust,egaburov/thrust,raygit/thrust,marksantos/thrust,andrewcorrigan/thrust-multi-permutation-iterator,arnabgho/thrust,arnabgho/thrust,zeryx/thrust,raygit/thrust,GrimDerp/thrust,zeryx/thrust,andrewcorrigan/thrust-multi-permutation-iterator,dachziegel/thrust,jaredhoberock/thrust,xiongzhanblake/thrust,thvasilo/thrust,sdalton1/thrust,xiongzhanblake/thrust_src,jaredhoberock/thrust,zhenglaizhang/thrust,GrimDerp/thrust,thrust/thrust,Ricardo666666/thrust,dachziegel/thrust,Ricardo666666/thrust,jaredhoberock/thrust,xiongzhanblake/thrust,sarvex/thrust,sarvex/thrust,marksantos/thrust,GrimDerp/thrust,thvasilo/thrust,sarvex/thrust,xiongzhanblake/thrust_src,thrust/thrust,egaburov/thrust,zeryx/thrust,mohamed-ali/thrust,andrewcorrigan/thrust-multi-permutation-iterator,marksantos/thrust,thrust/thrust,jaredhoberock/thrust,mohamed-ali/thrust,egaburov/thrust,xiongzhanblake/thrust_src,sdalton1/thrust,mohamed-ali/thrust,Ricardo666666/thrust,dachziegel/thrust,sdalton1/thrust,zhenglaizhang/thrust,jaredhoberock/thrust