vtables as collectable objects

[Dan Sugalski]

It'd be simple enough to do--prepend a PObj front to the vtables and 
allocate the vtables themselves out of a separate managed arena, and 
do a bit of custom mark noting. This'd make collecting up unused 
vtables easy enough. The downside to this is it means we add in a 
*lot* of extra pointer traversal, as we add in an extra live pointer 
for every live PMC in the system.

It's a lot of extra work for the DOD. I'm up for it if we have to, 
but I'd prefer to not do it if we don't have to.

Opinions, folks?
--
                                        Dan
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Dan Sugalski                          even samurai
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