Change the utils WhichPowerOf2 function to use a simpler algorithm.

src/arm/assembler-arm.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 430 matching lines @@
 
   // rm <shift_op> rs
   explicit Operand(Register rm, ShiftOp shift_op, Register rs);
 
   // Return true if this is a register operand.
   INLINE(bool is_reg() const);
 
   // Return true of this operand fits in one instruction so that no
   // 2-instruction solution with a load into the ip register is necessary.
   bool is_single_instruction() const;
+  bool must_use_constant_pool() const;
 
   inline int32_t immediate() const {
     ASSERT(!rm_.is_valid());
     return imm32_;
   }
 
   Register rm() const { return rm_; }
   Register rs() const { return rs_; }
   ShiftOp shift_op() const { return shift_op_; }
 
@@ skipping 830 matching lines @@
  public:
   EnsureSpace(Assembler* assembler) {
     assembler->CheckBuffer();
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_ASSEMBLER_ARM_H_