Use inline const instead of unsafe to implement MaybeUninit::uninit_array().

library/core/src/mem/maybe_uninit.rs

@@ -342,8 +342,7 @@ impl<T> MaybeUninit<T> {
     #[must_use]
     #[inline(always)]
     pub const fn uninit_array<const N: usize>() -> [Self; N] {
-        // SAFETY: An uninitialized `[MaybeUninit<_>; LEN]` is valid.
-        unsafe { MaybeUninit::<[MaybeUninit<T>; N]>::uninit().assume_init() }
+        [const { MaybeUninit::uninit() }; N]
     }
 
     /// Creates a new `MaybeUninit<T>` in an uninitialized state, with the memory being