legion: fix missing logic on fast path for acquire and filter instances in the mapper runtime
legion: fix missing logic on fast path for acquire and filter instances in the mapper runtime

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