[AST Mangler] Don't look into invalid conformances.
[AST Mangler] Don't look into invalid conformances.

roambotics/swift,benlangmuir/swift,roambotics/swift,benlangmuir/swift,JGiola/swift,JGiola/swift,JGiola/swift,roambotics/swift,apple/swift,apple/swift,glessard/swift,roambotics/swift,benlangmuir/swift,JGiola/swift,benlangmuir/swift,glessard/swift,apple/swift,roambotics/swift,apple/swift,apple/swift,glessard/swift,glessard/swift,glessard/swift,glessard/swift,benlangmuir/swift,JGiola/swift,roambotics/swift,JGiola/swift,benlangmuir/swift,apple/swift