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Rollup merge of #149102 - bend-n:maybe_uninit_slice, r=joboet
stabilize maybe_uninit_slice
Tracking issue: rust-lang/rust#63569
Closes: rust-lang/rust#63569
FCP completed: https://github.com/rust-lang/rust/issues/63569#issuecomment-3477510504
Removes:
```rs
pub const fn slice_as_ptr(this: &[MaybeUninit<T>]) -> *const T;
pub const fn slice_as_mut_ptr(this: &mut [MaybeUninit<T>]) -> *mut T;
```
