Return Value of Defclass

[Dan Larner <LARNER@SCORE.STANFORD.EDU>]

Parhaps this has appeared somewhere before, but defclass doesn't return the
nes class object as its result.  Problem appears to be down in the function
make-top-level-form, where an (eval-when ()) is generated for non GCLisp
and Coral versions.  Also MakeInstance doesnt't seem to call initialize-
instance as advertized in the spec (at least in the AAAI version). -- Dan
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