auto merge of #13154 : tomassedovic/rust/patch-1, r=alexcrichton
HashMap and HashSet require keys to implement TotalEq. This makes it possible to use TypeId as a HashMap key again. Question for reviewers: assuming we want to support `HashMap<TypeId, whatever>`, would it make sense to add a relevant test? If so, should it go to libcollections or libstd?
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