Doug Gregor 52e52b564b [GSB] Improve handling of conformances resolved by concrete types. ...

Centralize and simplify the handling of conformance requirements
resolved by same-type-to-concrete requirements in a few ways:

* Always store a ProtocolConformanceRef in via-superclass and
  via-concrete requirement sources, so we never lose this information.

* When concretizing a nested type based on its parent, use the
  via-concrete conformance information rather than performing lookup
  again, simplifying this operation considerably and avoiding
  redundant lookups.

* When adding a conformance requirement to a potential archetype that
  is equivalent to a concrete type, attempt to find and record the
  conformance.

Fixes SR-4295 / rdar://problem/31372308.

2017-06-23 09:34:57 -07:00

540 B

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