Make index-rearrange simplification rule less conservative.
Make index-rearrange simplification rule less conservative.

HIPERFIT/futhark,ihc/futhark,ihc/futhark,diku-dk/futhark,HIPERFIT/futhark,ihc/futhark,diku-dk/futhark,HIPERFIT/futhark,CulpaBS/wbBach,diku-dk/futhark,mrakgr/futhark,mrakgr/futhark,mrakgr/futhark,diku-dk/futhark,diku-dk/futhark