Rollup merge of #140511 - mathisbot:master, r=dtolnay
Stabilize `#![feature(non_null_from_ref)]`
This PR stabilizes the following:
```rust
impl<T: ?Sized> NonNull<T> {
pub const fn from_ref(reference: &T) -> NonNull<T>;
pub const fn from_mut(reference: &mut T) -> NonNull<T>;
}
```
The feature is tracked in [#130823](https://github.com/rust-lang/rust/issues/130823).
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