Commits on Jul 4, 2019

1. Break out of the correct number of scopes in loops …

   We were incorrectly breaking out of one too many drop scopes when
   generating MIR for loops and breakable blocks, resulting in use after
   free and associated borrow checker warnings.
   
   This wasn't noticed because the scope that we're breaking out of twice
   is only used for temporaries that are created for adjustments applied to
   the loop. Since loops generally propagate coercions to the `break`
   expressions, the only case we see this is when the type of the loop is a
   smart pointer to a trait object.

   

   matthewjasper committed Jul 4, 2019
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