swift234

Initial implementation of static functions on protocols.  <rdar://problem/11448251>.

There are currently two places where you can use a static function defined on a protocol:
on an object with the type of the protocol (discarding the base), and on an archetype in a generic function.  The AST for the protocol object case is probably okay;
the AST for the generic case is almost certainly wrong, but that whole area isn't really stable at the moment anyway.  The proposal in rdar://problem/11448251 will
add a third way: operators on protocols will be found by overload resolution.  (Having static functions on protocols opens up the possibility of metaprotocols,
but I don't think I need to worry about that for the moment.)



Swift SVN r2211