[interpreter]: Update BytecodeArrayBuilder register handling.

src/interpreter/bytecodes.cc

Index: src/interpreter/bytecodes.cc
diff --git a/src/interpreter/bytecodes.cc b/src/interpreter/bytecodes.cc
index 5cb2ddfbb2b1f241a0696007dc6d9858bdcc9f5a..8232b657e78e0d1de05c86db3754b287779a1ee9 100644
--- a/src/interpreter/bytecodes.cc
+++ b/src/interpreter/bytecodes.cc
@@ -4,6 +4,8 @@
 
 #include "src/interpreter/bytecodes.h"
 
+#include "src/interpreter/bytecode-array-builder.h"
+
 namespace v8 {
 namespace internal {
 namespace interpreter {
@@ -38,6 +40,20 @@ const char* Bytecodes::ToString(Bytecode bytecode) {
 
 
 // static
+const char* Bytecodes::OperandTypeToString(OperandType operand_type) {
+  switch (operand_type) {
+#define CASE(Name)           \
+  case OperandType::k##Name: \
+    return #Name;
+    OPERAND_TYPE_LIST(CASE)
+#undef CASE
+  }
+  UNREACHABLE();
+  return "";
+}
+
+
+// static
 uint8_t Bytecodes::ToByte(Bytecode bytecode) {
   return static_cast<uint8_t>(bytecode);
 }
@@ -114,7 +130,7 @@ std::ostream& Bytecodes::Decode(std::ostream& os,
         os << "#" << static_cast<int>(operand);
         break;
       case interpreter::OperandType::kReg:
-        os << "r" << static_cast<int>(operand);
+        os << "r" << Register::FromOperand(operand).index();
         break;
       case interpreter::OperandType::kNone:
         UNREACHABLE();
@@ -132,6 +148,11 @@ std::ostream& operator<<(std::ostream& os, const Bytecode& bytecode) {
   return os << Bytecodes::ToString(bytecode);
 }
 
+
+std::ostream& operator<<(std::ostream& os, const OperandType& operand_type) {
+  return os << Bytecodes::OperandTypeToString(operand_type);
+}
+
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8