Add sequential, __host__ __device__ version of the extrema functions. Lower the scalar extrema functions onto the sequential backend.
Add sequential, __host__ __device__ version of the extrema functions.
Lower the scalar extrema functions onto the sequential backend.

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