Fixed HMul::Canonicalize() to support SMI

src/hydrogen-instructions.cc

 // 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 1213 matching lines @@
   return this;
 }
 
 
 HValue* HMod::Canonicalize() {
   return this;
 }
 
 
 HValue* HDiv::Canonicalize() {
+  if (IsIdentityOperation(left(), right(), 1)) return left();
   return this;
 }
 
 
 HValue* HChange::Canonicalize() {
   return (from().Equals(to())) ? value() : this;
 }
 
 
 HValue* HWrapReceiver::Canonicalize() {
@@ skipping 2753 matching lines @@
       break;
     case kExternalMemory:
       stream->Add("[external-memory]");
       break;
   }
 
   stream->Add("@%d", offset());
 }
 
 } }  // namespace v8::internal