perform case return unboxing when on the simplifiers upwards pass to have it converge in fewer iterations
perform case return unboxing when on the simplifiers upwards pass to have it converge in fewer iterations

Ignore-this: ead3bf0430a8d4d709885029fa6828a1

darcs-hash:20090827085626-1a7c6-36c1c90c47af55e4dd85986aa75b14db0565dcd9

jimcrayne/jhc,jimcrayne/jhc,jimcrayne/jhc,jimcrayne/jhc