Improve GVN dependency tracking by adding parameters to certain flags.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 235b669933294a6d890ba0d099d2f77d41d11e2f..dd0c995aaa11828d558d673e5bf5787e5b22a6a3 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -884,6 +884,9 @@ class HGraphBuilder: public AstVisitor {
 };
 
 
+class HEffectSet;
+
+
 class HValueMap: public ZoneObject {
  public:
   HValueMap()
@@ -898,7 +901,7 @@ class HValueMap: public ZoneObject {
     Resize(kInitialSize);
   }
 
-  void Kill(int flags);
+  void Kill(const HEffectSet& effects);
 
   void Add(HValue* value) {
     present_flags_ |= value->flags();