Represent vtables as a top level SemIR construct #5472
Draft
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In the interests of not creating distinct vtables for each class specific - not
every specific needs the vtable, so move it into a separate entity that can be
made specific (eventually, not in this patch) only when needed (essentially when
generating a "home" for the class, but not otherwise).
Draft because this regresses cross-file vtable support. @zygoloid recommended
looking at facet type cross-file references, but I've not quite figured out how
to crack that yet, but WIP.