swift234

Base the implicit 'self' parameter type on DynamicSelf when appropriate.

To get here, make the implicit 'self' parameter a bit more like a
parsed parameter, by giving it a trivial TypeRepr so that pattern
validation will validate the type. This latter piece is important for
DynamicSelf, because we need the interface type of the function to
refer to the implicit generic parameter while the actual type refers
to the archetype.



Swift SVN r12757