Auto merge of #147634 - fmease:mv-var-to-dyn-buf-lints-next, r=jdonszelmann

Move even more early buffered lints to dyn lint diagnostics

Follow-up to rust-lang/rust#145881 and rust-lang/rust#145747.

I originally wanted to migrate most if not the entire rest of the early buffered lints. However, when trying to migrate the buffered lints used by check-cfg I encountered a roadblock. Namely, it depends on `TyCtxt` (well, `Option<TyCtxt>`) which makes it quite hard to migrate (see also rust-lang/rust#147634 (comment), rust-lang/rust#147634 (comment) & rust-lang/rust#149215).

So for now, I won't migrate it (maybe rust-lang/rust#149215 will find a solution), nor will I migrate the rest since it's quite tedious to migrate these. I'll leave them for future me.

Author: bors