auto merge of #13835 : alexcrichton/rust/localdata, r=brson
This commit brings the local_data api up to modern rust standards with a few key improvements: * All functionality is now exposed as a method on the keys themselves. Instead of importing std::local_data, you now use "key.set()" and "key.get()". * All closures have been removed in favor of RAII functionality. This means that get() and get_mut() no long require closures, but rather return Option<SmartPointer> where the smart pointer takes care of relinquishing the borrow and also implements the necessary Deref traits * The modify() function was removed to cut the local_data interface down to its bare essentials (similarly to how RefCell removed set/get). [breaking-change]
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