Auto merge of rust-lang#116391 - Nadrieril:constructorset, r=cjgillot

exhaustiveness: Rework constructor splitting

`SplitWildcard` was pretty opaque. I replaced it with a more legible abstraction: `ConstructorSet` represents the set of constructors for patterns of a given type. This clarifies responsibilities: `ConstructorSet` handles one clear task, and diagnostic-related shenanigans can be done separately.

I'm quite excited, I had has this in mind for years but could never quite introduce it. This opens up possibilities, including type-specific optimisations (like using a `FxHashSet` to collect enum variants, which had been [hackily attempted some years ago](rust-lang#76918)), my one-pass rewrite (rust-lang#116042), and future librarification.

Author: bors