[roll] Roll fuchsia [fuchsia-async] Some memory saving optimisations Prior to this change, tasks were held in Arc and then a Box. This CL removes one of them so that we just have a Box. The Arc reference count is now integrated into AtomicFuture's state, so that also saves the strong and weak reference counts that Arc has. There are some other memory savings: `Scope::all_tasks` is now a `HashSet` rather than a `HashMap`. Unfortunately, this did involve the use some more unsafe code, but AtomicFuture already had a fair bit of that. This might show some performance improvements due to improved CPU cache behaviour. Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1224064 Original-Revision: 7aa9a12a5dcfb42c1103682f3c89d27e6aff0a1a GitOrigin-RevId: 9a8793087becfb96b42f490c95d8179db7b7ec6c Change-Id: Ic032229ed7cfb89d4ccfe6a25d882bcf5738be92
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Next run:
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