added an init parameter to tuple reduction test
added an init parameter to tuple reduction test

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