Constant case for primExpFromExp.
Constant case for primExpFromExp.

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