swift234

Sema: Move semantic constraints on super/self.init out of the parser.

Instead of forcing full application of '{super,self}.init' in the parser, and installing the RebindSelf semantic expr node early, make these constraints to Sema-time checks, and parse '<expr>.init' as a regular postfix production. This is a better separation of concerns, and also opens the door to supporting 'metatype.init()' in more general expression contexts (though that part still needs some follow-up sema work).

Swift SVN r29343