swift234

Bias Objective-C method redeclaration diagnostics toward methods in the class.

Specifically, when a method defined in the class itself conflicts with
a method defined in an extension of the class, consider the method
defined in the class to be the original declaration (and complain
about the others). This is just QoI that improves predictability, and
is part of rdar://problem/18391046.

Swift SVN r23197