Avoid reading beyond the end of the input in CUDA's merge kernel.
Avoid reading beyond the end of the input in CUDA's merge kernel.

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