I think there's a bug in buildDispatchTable().  The subclass_head
pointer is never set.  I think this means that fixupDispatchTable
never fixes up subclasses...  But, my understanding of the JIT'r is
weak.  Anyway, if this isn't the problem, then there should
*somewhere* that the subclass_head pointer gets set.

Someone (Tim?) want to check this?

-Pat

...
if (class->superclass != NULL) {
	/* This may not be the best place to do this but at least
	   it is centralized.  */
	class->subclass_next = class->superclass->subclass_next;
	class->superclass->subclass_next = class;
...

Should be changed to: 

...
if (class->superclass != NULL) {
	/* This may not be the best place to do this but at least
	   it is centralized.  */
	class->subclass_next = class->superclass->subclass_head;
	class->superclass->subclass_head = class;
...