Revert "regent: Update RDIR."
Revert "regent: Update RDIR."

This reverts commit 21bcbecb107d7d0a8c63ddd323784284d9451289.

StanfordLegion/legion,StanfordLegion/legion,sdalton1/legion,StanfordLegion/legion,sdalton1/legion,sdalton1/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,sdalton1/legion,StanfordLegion/legion,sdalton1/legion,sdalton1/legion