swift

6b806e15 - [Substitution map] When the superclass conforms to a protocol directly, use it.

[Substitution map] When the superclass conforms to a protocol directly, use it. When looking up a conformance in a substitution map, check whether there is a superclass constraint that satisfies the conformance. If so, use it directly rather than going through a slower path to find it. Addresses rdar://problem/46655186.