use const exemplar in fill_functor to avoid const T -> T warning
use const exemplar in fill_functor to avoid const T -> T warning

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