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Add Atomic*::from_mut_slice Tracking issue #76314 for `from_mut` has a question about the possibility of `from_mut_slice`, and I found a real case for it. A user in the forum had a parallelism problem that could be solved by open-indexing updates to a vector of atomics, but they didn't want to affect the other code using that vector. Using `from_mut_slice`, they could borrow that data as atomics just long enough for their parallel loop. ref: https://users.rust-lang.org/t/sharing-vector-with-rayon-par-iter-correctly/72022