legion: Chain up trace complete and replay ops correctly for tasks with no region requirements (which still use a fence even after fence elision)
legion: Chain up trace complete and replay ops correctly for tasks with no region requirements (which still use a fence even after fence elision)

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