Rollup merge of #123522 - dtolnay:constatomicintoinner, r=Nilstrieb

Stabilize const Atomic*::into_inner

Partial stabilization for https://github.com/rust-lang/rust/issues/78729, for which the FCP has already completed.

The other `into_inner` functions in that tracking issue (`UnsafeCell`, `Cell`, `RefCell`) are blocked on https://github.com/rust-lang/rust/issues/73255 for now.

```console
error[E0493]: destructor of `UnsafeCell<T>` cannot be evaluated at compile-time
    --> library/core/src/cell.rs:2076:29
     |
2076 |     pub const fn into_inner(self) -> T {
     |                             ^^^^ the destructor for this type cannot be evaluated in constant functions
2077 |         self.value
2078 |     }
     |     - value is dropped here
```

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