Auto merge of #159026 - WaffleLapkin:fallback-refactorings, r=lcnr Type fallback refactorings - Don't merge different kinds of infer variables into `Ty` before matching them back - Do fallback only on root vars (this is semantically equivalent to what we currently do; unifying any of the infer vars from the same equivalence class necesserily affects all of them) (this makes https://github.com/rust-lang/rust/pull/159003 a bit less hacky though) - Do some simplification that has been allowed by the previous changes cc @lcnr
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