[RTG][Elaboration] Add support for arith constants #7890
+232
−19
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This prepares for
!rtg.bag
support in the elaboration pass which requires us to interpretindex
values.I've added a visitor for Arith ops to the RTG dialect since this visitor pattern is not used upstream. It probably doesn't make sense to upstream this due to what @youngar mentioned in #7855 (review)