Simplify Renamer a bit further, now that all variables are Idents.
Simplify Renamer a bit further, now that all variables are Idents.

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