bors 329fcd48e5 auto merge of #12338 : edwardw/rust/hygienic-break-continue, r=cmr
Makes labelled loops hygiene by performing renaming of the labels defined in e.g. `'x: loop { ... }` and then used in break and continue statements within loop body so that they act hygienically when used with macros.
    
Closes #12262.
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..
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