Stabilize as_array_of_cells

[jsimmons]

This PR stabilizes

impl<T, const N: usize> Cell<[T; N]> {
    pub const fn as_array_of_cells(&self) -> &[Cell<T>; N];
}

Stabilization report: #88248 (comment)
Closes: #88248

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[tgross35]

Cc @rust-lang/wg-const-eval because this includes a (trivial) const stabilization

[jieyouxu]

r? libs-api

[oli-obk]

Jup this is fine from the const side

[Amanieu]

The name is consistent with the existing stable as_slice_of_cells method.

@rfcbot merge

[rfcbot]

Team member @Amanieu has proposed to merge this. The next step is review by the rest of the tagged team members:

• @Amanieu
• @BurntSushi
• @dtolnay
• @joshtriplett
• @m-ou-se

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