regent: Normalize compound expressions whose sub-expressions can be lifted to tasks.         Fix for #711.
regent: Normalize compound expressions whose sub-expressions can be lifted to tasks.
        Fix for #711.

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