[interpreter]: Update BytecodeArrayBuilder register handling.

src/interpreter/bytecodes.h

Index: src/interpreter/bytecodes.h
diff --git a/src/interpreter/bytecodes.h b/src/interpreter/bytecodes.h
index 44bd03d9953fb618f17ee18096f15492ac129795..fec6ecf6aaa65853a82b86ad481da39fa2108eea 100644
--- a/src/interpreter/bytecodes.h
+++ b/src/interpreter/bytecodes.h
@@ -78,6 +78,9 @@ class Bytecodes {
   // Returns string representation of |bytecode|.
   static const char* ToString(Bytecode bytecode);
 
+  // Returns string representation of |operand_type|.
+  static const char* OperandTypeToString(OperandType operand_type);
+
   // Returns byte value of bytecode.
   static uint8_t ToByte(Bytecode bytecode);
 
@@ -107,6 +110,7 @@ class Bytecodes {
 };
 
 std::ostream& operator<<(std::ostream& os, const Bytecode& bytecode);
+std::ostream& operator<<(std::ostream& os, const OperandType& operand_type);
 
 }  // namespace interpreter
 }  // namespace internal