Objective-C messages with aggregate returns

Support for Objective-C message sends which return structures. Also includes a small fix for constant string handling that should have been in the last patch (sorry!) and a hook for generating selectors (rest of this implementation to follow in the next patch).

David

aggmsg.diff (6.79 KB)

Applied, thanks!
http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20080623/006227.html

-Chris