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>


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@154187 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/NSAPI.cpp b/lib/AST/NSAPI.cpp
index 8f03711..f5ea2c5 100644
--- a/lib/AST/NSAPI.cpp
+++ b/lib/AST/NSAPI.cpp
@@ -18,6 +18,7 @@
 
 IdentifierInfo *NSAPI::getNSClassId(NSClassIdKindKind K) const {
   static const char *ClassName[NumClassIds] = {
+    "NSObject",
     "NSString",
     "NSArray",
     "NSMutableArray",