[Interpreter] Add support for short (16 bit) operands.

src/interpreter/bytecode-array-iterator.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_BYTECODE_ARRAY_ITERATOR_H_
 #define V8_INTERPRETER_BYTECODE_ARRAY_ITERATOR_H_
 
 #include "src/handles.h"
 #include "src/interpreter/bytecodes.h"
 #include "src/objects.h"
 
 namespace v8 {
 namespace internal {
 namespace interpreter {
 
 class BytecodeArrayIterator {
  public:
   explicit BytecodeArrayIterator(Handle<BytecodeArray> bytecode_array);
 
   void Advance();
   bool done() const;
   Bytecode current_bytecode() const;
   int current_offset() const { return bytecode_offset_; }
   const Handle<BytecodeArray>& bytecode_array() const {
     return bytecode_array_;
   }
 
   int8_t GetSmi8Operand(int operand_index) const;
   int GetIndexOperand(int operand_index) const;
+  int GetWideIndexOperand(int operand_index) const;
   Register GetRegisterOperand(int operand_index) const;
   Handle<Object> GetConstantForIndexOperand(int operand_index) const;
 
   // Get the raw byte for the given operand. Note: you should prefer using the
   // typed versions above which cast the return to an appropriate type.
-  uint8_t GetRawOperand(int operand_index, OperandType operand_type) const;
+  uint32_t GetRawOperand(int operand_index, OperandType operand_type) const;
 
  private:
   Handle<BytecodeArray> bytecode_array_;
   int bytecode_offset_;
 
   DISALLOW_COPY_AND_ASSIGN(BytecodeArrayIterator);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODE_GRAPH_ITERATOR_H_