Fix performance regression in Kraken audio-oscillator.

src/ic.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 2607 matching lines @@
 
   left_kind_ = UpdateKind(left, left_kind_);
   right_kind_ = UpdateKind(right, right_kind_);
 
   int32_t fixed_right_arg_value = 0;
   bool has_fixed_right_arg =
       op_ == Token::MOD &&
       right->ToInt32(&fixed_right_arg_value) &&
       fixed_right_arg_value > 0 &&
       IsPowerOf2(fixed_right_arg_value) &&
-      FixedRightArgValueField::is_valid(fixed_right_arg_value) &&
+      FixedRightArgValueField::is_valid(WhichPowerOf2(fixed_right_arg_value)) &&
       (left_kind_ == SMI || left_kind_ == INT32) &&
       (result_kind_ == NONE || !fixed_right_arg_.has_value);
   fixed_right_arg_ = Maybe<int32_t>(has_fixed_right_arg,
                                     fixed_right_arg_value);
 
   result_kind_ = UpdateKind(result, result_kind_);
 
   if (!Token::IsTruncatingBinaryOp(op_)) {
     Kind input_kind = Max(left_kind_, right_kind_);
     if (result_kind_ < input_kind && input_kind <= NUMBER) {
@@ skipping 504 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal