Auto merge of #25744 - SimonSapin:cell-eq, r=alexcrichton

`core::cell::Cell<T>` and `core::cell::RefCell<T>` currently implement `PartialEq` when `T` does, and just defer to comparing `T` values. There is no reason the same shouldn’t apply to `Eq`.

This enables `#[derive(Eq, PartialEq)]` on e.g. structs that have a `RefCell` field.

r? @alexcrichton 

I’m unsure what to do with `#[stable]` attributes on `impl`s. `impl`s generated by `#[derive]` don’t have them.

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