Implement tracking and optimizations of packed arrays.

src/hydrogen.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 1071 matching lines @@
       bool is_store);
   HInstruction* BuildFastElementAccess(HValue* elements,
                                        HValue* checked_key,
                                        HValue* val,
                                        ElementsKind elements_kind,
                                        bool is_store);
 
   HInstruction* BuildMonomorphicElementAccess(HValue* object,
                                               HValue* key,
                                               HValue* val,
+                                              HValue* dependency,
                                               Handle<Map> map,
                                               bool is_store);
   HValue* HandlePolymorphicElementAccess(HValue* object,
                                          HValue* key,
                                          HValue* val,
                                          Expression* prop,
                                          int ast_id,
                                          int position,
                                          bool is_store,
                                          bool* has_side_effects);
@@ skipping 306 matching lines @@
   const char* filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_