realm: slightly less hacky way of choosing ib memory for address splitters
realm: slightly less hacky way of choosing ib memory for address splitters

StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion