swift

28a66a23 - [CSSimplify] Delay binding metatype instance types if one side is type variable

[CSSimplify] Delay binding metatype instance types if one side is type variable While matching two metatypes where one side is a class (which could have supertypes) and another is a type variable use `subtype` constraint to delay binding types together because there is a real possibility that there exists a superclass associated with yet free type variable which would be a better match when attempted. Resolves: rdar://problem/44816848