Mark scatter's functors as __host__ __device__ to support omp.
Mark scatter's functors as __host__ __device__ to support omp.

julianromera/thrust,hemmingway/thrust,malenie/thrust,UIKit0/thrust,bfurtaw/thrust,malenie/thrust,malenie/thrust,google-code-export/thrust,rdmenezes/thrust,julianromera/thrust,Vishwa07/thrust,julianromera/thrust,julianromera/thrust,h1arshad/thrust,Vishwa07/thrust,google-code-export/thrust,rdmenezes/thrust,bfurtaw/thrust,lishi0927/thrust,hemmingway/thrust,allendaicool/thrust,bfurtaw/thrust,h1arshad/thrust,levendlee/thrust,levendlee/thrust,UIKit0/thrust,Vishwa07/thrust,levendlee/thrust,rdmenezes/thrust,lishi0927/thrust,lishi0927/thrust,h1arshad/thrust,allendaicool/thrust,UIKit0/thrust,rdmenezes/thrust,UIKit0/thrust,levendlee/thrust,bfurtaw/thrust,allendaicool/thrust,h1arshad/thrust,hemmingway/thrust,allendaicool/thrust,google-code-export/thrust,lishi0927/thrust,google-code-export/thrust,malenie/thrust,Vishwa07/thrust,hemmingway/thrust