regent: Fix mutations in cross-products. Thanks to Rupanshu for working on the fix.
regent: Fix mutations in cross-products. Thanks to Rupanshu for working on the fix.

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