Fix silly bug in arrayShape.
Fix silly bug in arrayShape.

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