Auto merge of #42819 - scottmcm:swap-nonoverlapping, r=sfackler

Reuse the mem::swap optimizations to speed up slice::rotate

This is most helpful for compound types where LLVM didn't vectorize the loop.  Highlight: bench slice::rotate_medium_by727_strings gets 38% faster.

Exposes the swapping logic from PR https://github.com/rust-lang/rust/pull/40454 as `pub unsafe fn ptr::swap_nonoverlapping` under library feature `swap_nonoverlapping` https://github.com/rust-lang/rust/issues/42818.

(The new method seemed plausible, and was the simplest way to share the logic.  I'm not attached to it, though, so let me know if a different way would be better.)

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