First implementation of allocation elimination in Hydrogen.

src/zone.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 184 matching lines @@
   // always zero. The capacity must be non-negative.
   ZoneList(int capacity, Zone* zone)
       : List<T, ZoneAllocationPolicy>(capacity, ZoneAllocationPolicy(zone)) { }
 
   INLINE(void* operator new(size_t size, Zone* zone));
 
   // Construct a new ZoneList by copying the elements of the given ZoneList.
   ZoneList(const ZoneList<T>& other, Zone* zone)
       : List<T, ZoneAllocationPolicy>(other.length(),
                                       ZoneAllocationPolicy(zone)) {
-    AddAll(other, ZoneAllocationPolicy(zone));
+    AddAll(other, zone);
   }
 
   // We add some convenience wrappers so that we can pass in a Zone
   // instead of a (less convenient) ZoneAllocationPolicy.
   INLINE(void Add(const T& element, Zone* zone)) {
     List<T, ZoneAllocationPolicy>::Add(element, ZoneAllocationPolicy(zone));
   }
-  INLINE(void AddAll(const List<T, ZoneAllocationPolicy>& other,
-                     Zone* zone)) {
+  INLINE(void AddAll(const List<T, ZoneAllocationPolicy>& other, Zone* zone)) {
     List<T, ZoneAllocationPolicy>::AddAll(other, ZoneAllocationPolicy(zone));
   }
   INLINE(void AddAll(const Vector<T>& other, Zone* zone)) {
     List<T, ZoneAllocationPolicy>::AddAll(other, ZoneAllocationPolicy(zone));
   }
   INLINE(void InsertAt(int index, const T& element, Zone* zone)) {
     List<T, ZoneAllocationPolicy>::InsertAt(index, element,
                                             ZoneAllocationPolicy(zone));
   }
   INLINE(Vector<T> AddBlock(T value, int count, Zone* zone)) {
@@ skipping 28 matching lines @@
   void operator delete(void* pointer) { UNREACHABLE(); }
   void operator delete(void* pointer, Zone* zone) { UNREACHABLE(); }
 };
 
 
 typedef TemplateHashMapImpl<ZoneAllocationPolicy> ZoneHashMap;
 
 } }  // namespace v8::internal
 
 #endif  // V8_ZONE_H_