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Reductions are tricky because they require inplace updates since the reduction buffer are always initialized somewhere else.
This is supported now by tying the schedule of the initialization map to the schedule of the reduction map. The user should only specify one of the schedules, and the system will then automatically derive the other. Doing it this way means that we don't need any communication on the initialization states for these simple cases (although this will get trickier with WCR)