Remember to bring constant parameters into scope.
Remember to bring constant parameters into scope.

Fixes #348.

diku-dk/futhark,HIPERFIT/futhark,diku-dk/futhark,diku-dk/futhark,ihc/futhark,HIPERFIT/futhark,diku-dk/futhark,diku-dk/futhark,ihc/futhark,ihc/futhark,HIPERFIT/futhark