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rust: arc: remove ArcBorrow in favour of WithRef #1036

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With GATs, we don't need a separate type to represent a borrowed object
with a refcount, we can just use Rust's regular shared borrowing. In
this case, we use &WithRef<T> instead of ArcBorrow<'_, T>.

Co-developed-by: Boqun Feng boqun.feng@gmail.com
Signed-off-by: Boqun Feng boqun.feng@gmail.com
Signed-off-by: Wedson Almeida Filho walmeida@microsoft.com

This is in preparation for removing `ArcBorrow` and making `WithRef`
public.

Suggested-by: Björn Roy Baron <bjorn3_gh@protonmail.com>
Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com>
With GATs, we don't need a separate type to represent a borrowed object
with a refcount, we can just use Rust's regular shared borrowing. In
this case, we use `&WithRef<T>` instead of `ArcBorrow<'_, T>`.

Co-developed-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com>
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