Add function Arc/Rc::as_weak(…) to convert &Arc/Rc<T> to &Weak<T>#1

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jeremyBanks wants to merge 2 commits intomasterfrom

Commits on Aug 11, 2022

Mark `Rc`, `Arc`, and their `Weak`s as `#[repr(transparent)]`.
jeremyBanks
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Add unstable Arc::as_weak and Rc::as_weak behind new features `arc_as_weak` and `rc_as_weak`.
jeremyBanks
committed