Added a new attribute, objc_root_class, which informs the compiler when a root class is intentionally declared.
The warning this inhibits, -Wobjc-root-class, is opt-in for now. However, all clang unit tests that would trigger
the warning have been updated to use -Wno-objc-root-class. <rdar://problem/7446698>

llvm-svn: 154187
diff --git a/clang/test/SemaObjC/ClassPropertyNotObject.m b/clang/test/SemaObjC/ClassPropertyNotObject.m
index df2f835..02ed40a 100644
--- a/clang/test/SemaObjC/ClassPropertyNotObject.m
+++ b/clang/test/SemaObjC/ClassPropertyNotObject.m
@@ -1,5 +1,5 @@
-// RUN: %clang_cc1 -fsyntax-only -verify %s
-// RUN: %clang_cc1 -x objective-c++ -fsyntax-only -verify %s
+// RUN: %clang_cc1  -fsyntax-only -verify -Wno-objc-root-class %s
+// RUN: %clang_cc1 -x objective-c++ -fsyntax-only -verify -Wno-objc-root-class %s
 // rdar://10565506
 
 @protocol P @end