[Bug objc/48109] Objective-C class defs/refs are lost under LTO on Darwin for ABI0/1

[mikestump at comcast dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48109

--- Comment #1 from Mike Stump <mikestump at comcast dot net> 2011-03-14 
10:23:19 UTC ---
Not sure it matters, but, marking them as used should be enough...  Note, there
are a couple of ways to mark things.  TREE_USED and the lto incantation.