auto merge of #8669 : lkuper/rust/infer-refactor, r=nikomatsakis
This commit removes the "super_*" functions from typeck::infer::combine, and adds them as default methods on the Combine trait instead, making it possible to remove a lot of boilerplate from the various impls of Combine. I've been wanting to do this for over a year. In fact, it was my original motivation for default methods! It might be possible to tighten things up even more, but this is the bulk of it.
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