auto merge of #18127 : alexcrichton/rust/deriving-arc, r=aturon
This adds impls of Eq/Ord/PartialEq/PartialOrd/Show/Default to Arc<T>, and it also removes the `Send + Sync` bound on the `Clone` impl of Arc to make it more deriving-friendly. The `Send + Sync` requirement is still enforce on construction, of course!
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