Implement Copy and Clone for UnsafeCell<T>#55207

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jamesmunns wants to merge 3 commits intorust-lang:masterfrom jamesmunns:unsafe-cell-copy-clone

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Commits on Oct 19, 2018

Implement Copy and Clone for UnsafeCell<T>
James Munns
committed

Commits on Nov 1, 2018

Modify stability attributes so CI can build, only impl Clone if T is Copy
James Munns
committed
Remove call to clone, and explain why
James Munns
committed