swift234

[ClangImporter] When remapping an init method's name, change the selector too.

This is what we use to drop the variadic parameter on UIActionSheet and
UIAlertView's initializers, along with secretly adding a category to each
to provide the one-fewer-parameter init method implementation. However,
we haven't been using the Swift name for the method to generate Objective-C
calls for a while now--we use the @objc attribute. And that was still using
the original selector, and so we crashed.

Fixed by passing the new selector to the @objc attribute.

<rdar://problem/17012323>

Swift SVN r18582