Fix panic caused by new Try trait definition #8692
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Doesn't fix the bug I was trying to fix, but now that I did it anyway it seems fine to keep.
This isn't actually how it works, you have to specify the exact trait that has the associated type. Fixes rust-lang#8686.
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The new Try trait definition caused a query cycle for us. This adds recovery for that cycle, but also fixes the cause, which is that we went through the supertraits when resolving
<T as Trait>::Assoc, which isn't actually necessary. I also rewroteall_super_trait_refsto an iterator before I realized what the actual problem was, so I kept that.Fixes #8686.