ART: Enable more Clang warnings

Change-Id: Ie6aba02f4223b1de02530e1515c63505f37e184c
diff --git a/runtime/mirror/object.h b/runtime/mirror/object.h
index b730670..cfc8549 100644
--- a/runtime/mirror/object.h
+++ b/runtime/mirror/object.h
@@ -90,6 +90,9 @@
   void SetClass(Class* new_klass) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
   Object* GetReadBarrierPointer() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+#ifndef USE_BAKER_OR_BROOKS_READ_BARRIER
+  NO_RETURN
+#endif
   void SetReadBarrierPointer(Object* rb_ptr) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
   bool AtomicSetReadBarrierPointer(Object* expected_rb_ptr, Object* rb_ptr)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);