legion: small bug fix to work around unimplemented realm functionality for doing external waits on barriers
legion: small bug fix to work around unimplemented realm functionality for doing external waits on barriers

chuckatkins/legion,sdalton1/legion,sdalton1/legion,chuckatkins/legion,chuckatkins/legion,chuckatkins/legion,chuckatkins/legion,sdalton1/legion,StanfordLegion/legion,chuckatkins/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,sdalton1/legion,StanfordLegion/legion,chuckatkins/legion,sdalton1/legion,StanfordLegion/legion,sdalton1/legion,StanfordLegion/legion