Improve GVN dependency tracking by adding parameters to certain flags.

src/hydrogen.h

 // Copyright 2011 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 866 matching lines @@
 
   int inlined_count_;
 
   friend class FunctionState;  // Pushes and pops the state stack.
   friend class AstContext;  // Pushes and pops the AST context stack.
 
   DISALLOW_COPY_AND_ASSIGN(HGraphBuilder);
 };
 
 
+class HEffectSet;
+
+
 class HValueMap: public ZoneObject {
  public:
   HValueMap()
       : array_size_(0),
         lists_size_(0),
         count_(0),
         present_flags_(0),
         array_(NULL),
         lists_(NULL),
         free_list_head_(kNil) {
     ResizeLists(kInitialSize);
     Resize(kInitialSize);
   }
 
-  void Kill(int flags);
+  void Kill(const HEffectSet& effects);
 
   void Add(HValue* value) {
     present_flags_ |= value->flags();
     Insert(value);
   }
 
   HValue* Lookup(HValue* value) const;
   HValueMap* Copy() const { return new HValueMap(this); }
 
  private:
@@ skipping 182 matching lines @@
   const char* filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_