swift234

Hard-code the Cocoa error domain mapping using the results of a simple script.

Bridging the Cocoa error domain requires us to gather constants from
Foundation, CoreData, and AppKit, then pulling those into a single
(_)NSCocoaError enum that conforms to
_ObjectiveCBridgeableErrorType.

Rather than using a table extracted from the appropriate Cocoa headers
and pushing that through gyb, just hardcode the resuting Swift code,
which is produced (manually) by an enumeration-parsing script. Thanks
to Dave for pointing out that I was holding gyb wrong.

... and apologies for the Perl.

Long term, we need a better solution here, but this will suffice for
the short term.

Swift SVN r28560