Remove write-barriers for stores to new-space objects.

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 1205 matching lines @@
   int count_;  // The number of values stored in the HValueMap.
   GVNFlagSet present_flags_;  // All flags that are in any value in the
                               // HValueMap.
   HValueMapListElement* array_;  // Primary store - contains the first value
   // with a given hash.  Colliding elements are stored in linked lists.
   HValueMapListElement* lists_;  // The linked lists containing hash collisions.
   int free_list_head_;  // Unused elements in lists_ are on the free list.
 };
 
 
+class HSideEffectMap BASE_EMBEDDED {
+ public:
+  HSideEffectMap();
+  HSideEffectMap(HSideEffectMap* other);
+
+  void Kill(GVNFlagSet flags);
+
+  void Store(GVNFlagSet flags, HInstruction* instr);
+
+  bool IsEmpty() const { return count_ == 0; }
+
+  inline HInstruction* operator[](int i) const {
+    ASSERT(0 <= i);
+    ASSERT(i < kNumberOfTrackedSideEffects);
+    return data_[i];
+  }
+  inline HInstruction* at(int i) const { return operator[](i); }
+
+ private:
+  int count_;
+  HInstruction* data_[kNumberOfTrackedSideEffects];
+};
+
+
 class HStatistics: public Malloced {
  public:
   void Initialize(CompilationInfo* info);
   void Print();
   void SaveTiming(const char* name, int64_t ticks, unsigned size);
   static HStatistics* Instance() {
     static SetOncePointer<HStatistics> instance;
     if (!instance.is_set()) {
       instance.set(new HStatistics());
     }
@@ skipping 138 matching lines @@
   const char* filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_