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Auto merge of #133436 - nnethercote:rm-NtVis-NtTy, r=petrochenkov
Remove `NtVis` and `NtTy`
The next part of #124141. The first actual remove of `Nonterminal` variants. `NtVis` is a simple case that doesn't get much use, but `NtTy` is more complex.
r? `@petrochenkov`
