Implement Realm reductions for CUDA - #1669
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Realm reduction operators need to be compiled from a
.cufile so that we have them available in CUDA as well as C++.Also adds a bit of CMake machinery to allow
ff_add_libraryto include CUDA code. In principlekernelscould be rewritten now to useff_add_librarybut I haven't attempted to do so in this PR.Updated Realm to get StanfordLegion/realm#473 so that we don't need to work around including PRealm from NVCC.
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