Fix internaliser binding-insertion for loops and let-withs.
Fix internaliser binding-insertion for loops and let-withs.

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