swift234

IRGen: Fix inaccurate assert in PolymorphicConvention.

A generic NominalTypeDecl can have more archetypes than a BoundGenericType referencing that decl if the requirements of its type parameters introduce associated types. This still doesn't quite fix codegen for class methods that use associated types (e.g. <rdar://problem/13793646>) because we still fail to actually bind metadata for the archetypes of those associated types.

Swift SVN r5035