Implement IfNot() in terms of If(), and add missing IfNot(HValue*) method.

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 1287 matching lines @@
       return compare;
     }
 
     template<class Condition, class P2, class P3>
     Condition* If(HValue* p1, P2 p2, P3 p3) {
       Condition* compare = builder()->New<Condition>(p1, p2, p3);
       AddCompare(compare);
       return compare;
     }
 
+    template<class Condition>
+    Condition* IfNot(HValue* p) {
+      Condition* compare = If<Condition>(p);
+      HBasicBlock* block0 = compare->SuccessorAt(0);
+      HBasicBlock* block1 = compare->SuccessorAt(1);
+      compare->SetSuccessorAt(0, block1);
+      compare->SetSuccessorAt(1, block0);
+      return compare;
+    }
+
     template<class Condition, class P2>
     Condition* IfNot(HValue* p1, P2 p2) {
-      Condition* compare = builder()->New<Condition>(p1, p2);
-      AddCompare(compare);
+      Condition* compare = If<Condition>(p1, p2);
       HBasicBlock* block0 = compare->SuccessorAt(0);
       HBasicBlock* block1 = compare->SuccessorAt(1);
       compare->SetSuccessorAt(0, block1);
       compare->SetSuccessorAt(1, block0);
       return compare;
     }
 
     template<class Condition, class P2, class P3>
     Condition* IfNot(HValue* p1, P2 p2, P3 p3) {
-      Condition* compare = builder()->New<Condition>(p1, p2, p3);
-      AddCompare(compare);
+      Condition* compare = If<Condition>(p1, p2, p3);
       HBasicBlock* block0 = compare->SuccessorAt(0);
       HBasicBlock* block1 = compare->SuccessorAt(1);
       compare->SetSuccessorAt(0, block1);
       compare->SetSuccessorAt(1, block0);
       return compare;
     }
 
     template<class Condition>
     Condition* OrIf(HValue *p) {
       Or();
@@ skipping 1037 matching lines @@
   }
 
  private:
   HGraphBuilder* builder_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_