Fix SB problems in slice sorting

Most of these problems originate in use of get_unchecked_mut.

When calling ptr::copy_nonoverlapping, using get_unchecked_mut for both
arguments causes the borrow created to make the second pointer to invalid the
first.

The pairs of identical MaybeUninit::slice_as_mut_ptr calls similarly
invalidate each other.

There was also a similar borrow invalidation problem with the use of
slice::get_unchecked_mut to derive the pointer for the CopyOnDrop.

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