swift234

Commit DaveA's API changes to 'print', along with the compiler changes necessary to support them.

There's still work left to do. In terms of next steps, there's still rdar://problem/22126141, which covers removing the 'workaround' overloads for print (that prevent bogus overload resolution failures), as well as providing a decent diagnostic when users invoke print with 'appendNewline'.

Swift SVN r30976