examples: modify stenci mapper to not rely on the runtime to provide valid instances for empty regions
examples: modify stenci mapper to not rely on the runtime to provide valid instances for empty regions

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