Fix shortcutting bug in HInferRepresentation

src/hydrogen-instructions.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 570 matching lines @@
     type_ = type;
   }
 
   // An operation needs to override this function iff:
   //   1) it can produce an int32 output.
   //   2) the true value of its output can potentially be minus zero.
   // The implementation must set a flag so that it bails out in the case where
   // it would otherwise output what should be a minus zero as an int32 zero.
   // If the operation also exists in a form that takes int32 and outputs int32
   // then the operation should return its input value so that we can propagate
-  // back.  There are two operations that need to propagate back to more than
-  // one input.  They are phi and binary add.  They always return NULL and
-  // expect the caller to take care of things.
+  // back.  There are three operations that need to propagate back to more than
+  // one input.  They are phi and binary div and mul.  They always return NULL
+  // and expect the caller to take care of things.
   virtual HValue* EnsureAndPropagateNotMinusZero(BitVector* visited) {
     visited->Add(id());
     return NULL;
   }
 
   bool IsDefinedAfter(HBasicBlock* other) const;
 
   // Operands.
   virtual int OperandCount() = 0;
   virtual HValue* OperandAt(int index) = 0;
@@ skipping 3542 matching lines @@
 
   DECLARE_CONCRETE_INSTRUCTION(In)
 };
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_