[Interpreter] Add ValidBytecodeOperandSizeCombinationsIterator.

src/interpreter/bytecodes.h

Index: src/interpreter/bytecodes.h
diff --git a/src/interpreter/bytecodes.h b/src/interpreter/bytecodes.h
index 3ad737fbc92d5e92bb4855ac4b54ebf81195e8a7..49a31e0de5613ec5fcca6c9f75652cbff180ada6 100644
--- a/src/interpreter/bytecodes.h
+++ b/src/interpreter/bytecodes.h
@@ -530,6 +530,29 @@ 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