0.pre8.74:

0.pre8.74:
	Couple the classes and type systems some more
	... forward-referenced-classes are now valid types.

Note: this fix follows the cmucl fix perhaps slightly too closely.  It
creates CLASSOIDs for forward-referenced-classes slightly eagerly, where
previously no such CLASSOID was generated.  This may have some as-yet
unnoticed effect.