[Interpreter] Add ValidBytecodeOperandSizeCombinationsIterator.

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 512 matching lines @@
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(Bytecodes);
 };
 
 std::ostream& operator<<(std::ostream& os, const Bytecode& bytecode);
 std::ostream& operator<<(std::ostream& os, const OperandScale& operand_scale);
 std::ostream& operator<<(std::ostream& os, const OperandSize& operand_size);
 std::ostream& operator<<(std::ostream& os, const OperandType& operand_type);
 
+class ValidBytecodeOperandSizeCombinationsIterator final {
+ public:
+  ValidBytecodeOperandSizeCombinationsIterator();
+
+  void Advance();
+  bool done() { return reached_end_; }
+
+  OperandScale operand_scale() const { return operand_scale_; }
+  Bytecode bytecode() const { return bytecode_; }
+
+ private:
+  void IncrementPosition();
+  bool CurrentCombinationIsValid();
+
+  bool reached_end_;
+  OperandScale operand_scale_;
+  Bytecode bytecode_;
+
+  static const Bytecode kFirstBytecode = static_cast<Bytecode>(0);
+
+  DISALLOW_COPY_AND_ASSIGN(ValidBytecodeOperandSizeCombinationsIterator);
+};
+
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODES_H_