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Tell rustc about unused bits in Span.
This shrinks the size of `Option<Span>` and similar types, which shrinks several AST and HIR nodes. The most important of these are `hir::Expr` and `ast::Ty`. This change was first attempted in rust-lang#93747 where it had little effect. But the improved niche-filling implemented by rust-lang#94075 means this change now has a much bigger effect. Co-authored-by: Camille Gillot <[email protected]>
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