Add templatized Run() method for Hydrogen phases.

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index 277448914d2379ff24b638ca516d9925920c116f..97c9a6a21b1ffe9a0fefc8428c9ea1954515294f 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -427,6 +427,9 @@ class HGraph: public ZoneObject {
   HConstant* GetConstant(SetOncePointer<HConstant>* pointer,
                          int32_t integer_value);
 
+  template<class Phase>
+  void Run() { Phase phase(this); phase.Run(); }
+
   void MarkLive(HValue* ref, HValue* instr, ZoneList<HValue*>* worklist);
   void MarkLiveInstructions();
   void RemoveDeadInstructions();