Track heap objects.

src/hydrogen-instructions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5200 matching lines @@
         offset_(offset) {
     ASSERT(object != NULL);
     SetOperandAt(0, object);
     SetOperandAt(1, typecheck != NULL ? typecheck : object);
 
     if (FLAG_track_fields && field_representation.IsSmi()) {
       set_type(HType::Smi());
       set_representation(Representation::Tagged());
     } else if (FLAG_track_double_fields && field_representation.IsDouble()) {
       set_representation(field_representation);
+    } else if (FLAG_track_heap_object_fields &&
+               field_representation.IsHeapObject()) {
+      set_type(HType::NonPrimitive());
+      set_representation(Representation::Tagged());
     } else {
       set_representation(Representation::Tagged());
     }
     SetFlag(kUseGVN);
     if (FLAG_track_double_fields && representation().IsDouble()) {
       ASSERT(is_in_object);
       ASSERT(offset == HeapNumber::kValueOffset);
       SetGVNFlag(kDependsOnDoubleFields);
     } else if (is_in_object) {
       SetGVNFlag(kDependsOnInobjectFields);
@@ skipping 1231 matching lines @@
   virtual bool IsDeletable() const { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_