Doug Gregor cdb38c1e97 [GSB] Check all superclass constraints during finalization. ...

Use the same infrastructure we have for same-type-to-concrete
constraints to check superclass constraints. Specifically,

* Track all superclass constraints; never "update" a requirement source
* Remove self-derived superclass constraints
* Pick the best superclass constraint within each connected component
  of an equivalence class and use that for requirement generation.
* Diagnose conflicting superclass requirements during finalization
* Diagnose redundant superclass requirements (during finalization)

2017-02-28 16:14:30 -08:00

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