swift234

Fix what looks like a copy-pasto error in the protocol conformance code.

This code is supposed to check that each subclass of ProtocolConformance
implements the invoked method. The copy-pasto was that when we were
supposed to be checking if SpecializedProtocolConformance overrode a
method, we were instead checking if InheritedProtocolConformance did so.
Luckily when I fixed this it looks like we are implementing all the
appropriate methods. But still a nice catch I feel.

Swift SVN r15273