swift234

Parse DynamicSelf as a type, restricted to contexts in which it is allowed.

Take DynamicSelf as a keyword, but parse it as a type-identifier.
Teach function declaration checking to sniff out and validate
DynamicSelf early, with appropriate QoI for references to DynamicSelf
that appear in other places.

As a temporary hack, DynamicSelf resolves to an alias for 'Self' in a
protocol or the enclosing nominal type.

Swift SVN r12708