Fix soundness bug and refactor away unnecessary UnsafeCell. #290
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- Fix a potential soundness bug by using ManuallyDrop. - Change SharedValue to contain a T instead of a UnsafeCell<T> and remove as_ptr method. - Swap several calls to `HashMap::get_key_value` with calls to `Hashmap::get_key_value_mut` in order to make using UnsafeCell redundant. - Make unsafe blocks smaller and more refined.
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HashMap::get_key_valuewith calls toHashmap::get_key_value_mutin order to make using UnsafeCell redundant.