auto merge of #19113 : nikomatsakis/rust/unboxed-boxed-closure-unification, r=acrichto
Use the expected type to infer the argument/return types of unboxed closures. Also, in `||` expressions, use the expected type to decide if the result should be a boxed or unboxed closure (and if an unboxed closure, what kind). This supercedes PR #19089, which was already reviewed by @pcwalton.
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