libcore: Make ChainIterator take two different-typed Iterators.
#6177
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bors
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May 2, 2013
`T: Iterator<A>` and `U: Iterator<A>` should be able to `chain` whether `T` and `U` are same or not.
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T: Iterator<A>andU: Iterator<A>should be able tochainwhetherTandUare same or not.