Clean up the redundant Int32Constant check which is covered by double case

src/hydrogen.cc

 // Copyright 2013 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 6812 matching lines @@
             HInstruction* sqrt =
                 HUnaryMathOperation::New(zone(), context, left, kMathPowHalf);
             AddInstruction(sqrt);
             // MathPowHalf doesn't have side effects so there's no need for
             // an environment simulation here.
             ASSERT(!sqrt->HasObservableSideEffects());
             result = HDiv::New(zone(), context, one, sqrt);
           } else if (exponent == 2.0) {
             result = HMul::New(zone(), context, left, left);
           }
-        } else if (right->EqualsInteger32Constant(2)) {
-          result = HMul::New(zone(), context, left, left);
         }
 
         if (result == NULL) {
           result = HPower::New(zone(), context, left, right);
         }
         ast_context()->ReturnInstruction(result, expr->id());
         return true;
       }
       break;
     case kMathRandom:
@@ skipping 3020 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal