src/hotspot/share/code/compiledMethod.cpp

                                int frame_complete_offset, int frame_size, ImmutableOopMapSet* oop_maps,
                                bool caller_must_gc_arguments)
   : CodeBlob(name, type, layout, frame_complete_offset, frame_size, oop_maps, caller_must_gc_arguments),
     _mark_for_deoptimization_status(not_marked),
     _is_unloading_state(0),
-    _method(method)
+    _method(method),
+    _gc_data(NULL)
 {
   init_defaults();
   clear_unloading_state();
 }
 

@@ -56,11 +57,12
                                OopMapSet* oop_maps, bool caller_must_gc_arguments)
   : CodeBlob(name, type, CodeBlobLayout((address) this, size, header_size, cb), cb,
              frame_complete_offset, frame_size, oop_maps, caller_must_gc_arguments),
     _mark_for_deoptimization_status(not_marked),
     _is_unloading_state(0),
-    _method(method)
+    _method(method),
+    _gc_data(NULL)
 {
   init_defaults();
   clear_unloading_state();
 }