Drop some unused code

src/hydrogen-instructions.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/base/bits.h"
 #include "src/double.h"
 #include "src/factory.h"
 #include "src/hydrogen-infer-representation.h"
@@ skipping 2193 matching lines @@
  * This method detects if phi is an induction variable, with phi_operand as
  * its "incremented" value (the other operand would be the "base" value).
  *
  * It cheks is phi_operand has the form "phi + constant".
  * If yes, the constant is the increment that the induction variable gets at
  * every loop iteration.
  * Otherwise it returns 0.
  */
 int32_t InductionVariableData::ComputeIncrement(HPhi* phi,
                                                 HValue* phi_operand) {
-  if (!phi_operand->representation().IsInteger32()) return 0;
+  if (!phi_operand->representation().IsSmiOrInteger32()) return 0;
 
   if (phi_operand->IsAdd()) {
     HAdd* operation = HAdd::cast(phi_operand);
     if (operation->left() == phi &&
         operation->right()->IsInteger32Constant()) {
       return operation->right()->GetInteger32Constant();
     } else if (operation->right() == phi &&
                operation->left()->IsInteger32Constant()) {
       return operation->left()->GetInteger32Constant();
     }
@@ skipping 2579 matching lines @@
       break;
     case HObjectAccess::kExternalMemory:
       os << "[external-memory]";
       break;
   }
 
   return os << "@" << access.offset();
 }
 
 } }  // namespace v8::internal