swift234

Implement support for calling Objective-C instance methods imported from Clang.

Tweak the import of Objective-C methods to build the proper FuncExpr
and tag the FuncDecl as an Objective-C method, along with a few other
tweaks, so calls to the imported Objective-C methods go through
objc_msgSend().

At this moment, this is aborting in the Objective-C runtime due to an
unrecognized selector. The issue does not appear related to the
importer.


Swift SVN r3255