legion: ignore memory in PointerConstraint and use realm-suggested memory
legion: ignore memory in PointerConstraint and use realm-suggested memory

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