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Auto merge of #104282 - cjgillot:intern-span, r=compiler-errors
Hash spans when interning types
Ignoring hash for spans creates an inconsistency between the `Hash` impl for `WithStableHash`, which takes them into account, and the `HashStable` impl which does not.
cc `@compiler-errors`
Fixes https://github.com/rust-lang/rust/issues/104271
Fixes https://github.com/rust-lang/rust/issues/104255
Fixes https://github.com/rust-lang/rust/issues/104238
