Commits on Apr 5, 2016

1. Reinstate fast_reject for overlap checking …

   The initial implementation of specialization did not use the
   `fast_reject` mechanism when checking for overlap, which caused a
   serious performance regression in some cases.
   
   This commit modifies the specialization graph to use simplified types
   for fast rejection when possible, and along the way refactors the logic
   for building the specialization graph.
   
   Closes rust-lang#32499

   

   aturon committed Apr 5, 2016
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