Refactor PyInterpreter to use normal vtables (#84388)
I realized that we can deal with the dead vtable problem by...
introducing another indirection! The resulting code is worse
(you have to do one more dereference to get to the vtable), but
the reduction in boilerplate is, IMO, worth it.
I did this refactor because I'm about to add a lot more methods
to PyInterpreter to handle expunging SymInt from TensorImpl.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/84388
Approved by: https://github.com/albanD
