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Fix memory space for exclusivePrefixSum

Arndt, Daniel requested to merge github/fork/masterleinad/fix_memory_space_exclusive_prefixsum into master

Created by: masterleinad

Without this patch, we try to assign between a Kokkos::View with memory space CudaSpace and CudaUVMSpace in case Kokkos is built with UVM support and the original memory space is CudaSpace.

Up to now, we tried to use the default memory space associated with the execution space in ExclusiveScanFunctor which turned out to be CudaUVMSpace in this case. Hence, the constructor call assigns a Kokkos::View with memory space CudaSpace to a KokkosView with memory space CudaUVMSpace which is not allowed.

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