[project @ 1999-04-23 13:53:28 by simonm]

Support for

	dataToTag# :: a -> Int#  (if a is a data type)

and (partial) support for

	tagToEnum# :: Int# -> a  (if a is an enumerated type)

The con2tag functions generated by derived Eq,Ord and Enum instances
are now replaced by dataToTag# for data types with a large number of
constructors.