swift234

Allow 'Any' as an IBAction's sender and an IBOutlet's type. (#4320)

With id-as-Any, /existing/ IBAction methods that have unconstrained
sender parameters are being imported as taking 'Any?', and those
methods then can't be overridden in Swift.

We still don't allow arbitrary bridgeable types for IBActions and
IBOutlets. This makes enough sense for value types, but might get us
into trouble with swift_newtype at some point.

rdar://problem/27853737
(cherry picked from commit ed01f89401674e7c738657880c399671637a2d40)