swift234

[Clang importer] Stop creating property/subscript getter/setter thunks.

Instead of synthesizing Swift code for the property and subscript
getters and setters we import from Objective-C, just create the
declarations and mark them as being Objective-C (foreign) entry
points. This means that we'll use the Objective-C entry points (via
objc_msgSend).


Swift SVN r8692