Auto merge of #96100 - Raekye:master, r=dtolnay

Change `NonNull::as_uninit_*` to take self by value (as opposed to reference), matching primitive pointers.

Copied from my comment on [#75402](https://github.com/rust-lang/rust/issues/75402#issuecomment-1100496823):

> I noticed that `as_uninit_*` on pointers take `self` by value (and pointers are `Copy`), e.g. see [`as_uninit_mut`](https://doc.rust-lang.org/core/primitive.pointer.html#method.as_uninit_mut).
>
> However, on `NonNull`, these functions take `self` by reference, e.g. see the function with the same name by for `NonNull`: [`as_uninit_mut`](https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_uninit_mut) takes `self` by mutable reference. Even more inconsistent, [`as_uninit_slice_mut`](https://doc.rust-lang.org/std/ptr/struct.NonNull.html#method.as_uninit_slice_mut) returns a mutable reference, but takes `self` by immutable reference.
>
> I think these methods should take `self` by value for consistency. The returned lifetime is unbounded anyways and not tied to the pointer/NonNull value anyways

I realized the change is trivial (if desired) so here I am creating my first PR. I think it's not a breaking change since (it's on nightly and) `NonNull` is `Copy`; all previous usages of these methods taking `self` by reference should continue to compile. However, it might cause warnings to appear on usages of `NonNull::as_uninit_mut`, which used to require the the `NonNull` variable be declared `mut`, but now it's not necessary.

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