First step to cleanup the power-of-2 mess.

src/hydrogen-instructions.h

 // 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.
 
 #ifndef V8_HYDROGEN_INSTRUCTIONS_H_
 #define V8_HYDROGEN_INSTRUCTIONS_H_
 
 #include "src/v8.h"
 
 #include "src/allocation.h"
+#include "src/base/bits.h"
 #include "src/code-stubs.h"
 #include "src/conversions.h"
 #include "src/data-flow.h"
 #include "src/deoptimizer.h"
 #include "src/feedback-slots.h"
 #include "src/hydrogen-types.h"
 #include "src/small-pointer-list.h"
 #include "src/unique.h"
 #include "src/utils.h"
 #include "src/zone.h"
@@ skipping 3817 matching lines @@
   void SetOperandPositions(Zone* zone,
                            HSourcePosition left_pos,
                            HSourcePosition right_pos) {
     set_operand_position(zone, 1, left_pos);
     set_operand_position(zone, 2, right_pos);
   }
 
   bool RightIsPowerOf2() {
     if (!right()->IsInteger32Constant()) return false;
     int32_t value = right()->GetInteger32Constant();
-    return IsPowerOf2(value) || IsPowerOf2(-value);
+    if (value < 0) {
+      return base::bits::IsPowerOfTwo32(static_cast<uint32_t>(-value));
+    }
+    return base::bits::IsPowerOfTwo32(static_cast<uint32_t>(value));
   }
 
   DECLARE_ABSTRACT_INSTRUCTION(BinaryOperation)
 
  private:
   bool IgnoreObservedOutputRepresentation(Representation current_rep);
 
   Representation observed_input_representation_[2];
   Representation observed_output_representation_;
 };
@@ skipping 3990 matching lines @@
 };
 
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_