Make commutativeLambda more powerful.
Make commutativeLambda more powerful.

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