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This pulls in rust-lang/rustc-rayon#8 to fix #81425. (h/t @ammaraskar) That revealed weak constraints on `rustc_arena::DropArena`, because its `DropType` was holding type-erased raw pointers to generic `T`. We can implement `Send` for `DropType` (under `cfg(parallel_compiler)`) by requiring all `T: Send` before they're type-erased.