Eduard-Mihai Burtescu fa57f358a3 Rollup merge of #35392 - malbarbo:cell-from, r=brson
Implement From for Cell, RefCell and UnsafeCell

Considering that `From` is implemented for `Box`, `Rc` and `Arc`, it seems [reasonable](https://internals.rust-lang.org/t/implementing-from-t-for-other-std-types/3744) to implement it for `Cell`, `RefCell` and `UnsafeCell`.
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