Make incremental marking clear type feedback cells.

src/objects-visiting-inl.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 198 matching lines @@
        idx < Context::GLOBAL_CONTEXT_SLOTS;
        ++idx) {
     Object** slot =
         HeapObject::RawField(object, FixedArray::OffsetOfElementAt(idx));
     collector->RecordSlot(slot, slot, *slot);
   }
 }
 
 
 template<typename StaticVisitor>
+void StaticMarkingVisitor<StaticVisitor>::VisitCode(
+    Map* map, HeapObject* object) {
+  Heap* heap = map->GetHeap();
+  Code* code = Code::cast(object);
+  if (FLAG_cleanup_code_caches_at_gc) {
+    code->ClearTypeFeedbackCells(heap);
+  }
+  code->CodeIterateBody<StaticVisitor>(heap);
+}
+
+
+template<typename StaticVisitor>
 void StaticMarkingVisitor<StaticVisitor>::VisitJSRegExp(
     Map* map, HeapObject* object) {
   int last_property_offset =
       JSRegExp::kSize + kPointerSize * map->inobject_properties();
   StaticVisitor::VisitPointers(map->GetHeap(),
       HeapObject::RawField(object, JSRegExp::kPropertiesOffset),
       HeapObject::RawField(object, last_property_offset));
 }
 
 
@@ skipping 48 matching lines @@
   RelocIterator it(this, mode_mask);
   for (; !it.done(); it.next()) {
     it.rinfo()->template Visit<StaticVisitor>(heap);
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_VISITING_INL_H_