MIPS: Fix unaligned read of bytecodes in interpreter.

src/interpreter/bytecodes.h

 // Copyright 2015 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_INTERPRETER_BYTECODES_H_
 #define V8_INTERPRETER_BYTECODES_H_
 
 #include <iosfwd>
 
 // Clients of this interface shouldn't depend on lots of interpreter internals.
@@ skipping 282 matching lines @@
   static OperandSize SizeOfOperand(OperandType operand);
 
   // Return true if the bytecode is a jump or a conditional jump taking
   // an immediate byte operand (OperandType::kImm8).
   static bool IsJump(Bytecode bytecode);
 
   // Return true if the bytecode is a jump or conditional jump taking a
   // constant pool entry (OperandType::kIdx).
   static bool IsJumpConstant(Bytecode bytecode);
 
-  // Converts bytes[0] and bytes[1] to a 16 bit 'short' operand value.
-  static uint16_t ShortOperandFromBytes(const uint8_t* bytes);
-
-  // Converts 16 bit 'short' |operand| into bytes_out[0] and bytes_out[1].
-  static void ShortOperandToBytes(uint16_t operand, uint8_t* bytes_out);
-
   // Decode a single bytecode and operands to |os|.
   static std::ostream& Decode(std::ostream& os, const uint8_t* bytecode_start,
                               int number_of_parameters);
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(Bytecodes);
 };
 
 std::ostream& operator<<(std::ostream& os, const Bytecode& bytecode);
 std::ostream& operator<<(std::ostream& os, const OperandType& operand_type);
 std::ostream& operator<<(std::ostream& os, const OperandSize& operand_type);
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODES_H_