Add missing V8_EXPORT_PRIVATE to operator<< for OperandType

The missing export caused component build breakage when
Bytecodes::SizeOfOperand was moved into the header in
https://codereview.chromium.org/2950993002.

BUG=none

Review-Url: https://codereview.chromium.org/2954353002
Cr-Commit-Position: refs/heads/master@{#46228}

src/interpreter/bytecode-operands.h

@@ -130,7 +130,8 @@ V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os,
                                            const OperandScale& operand_scale);
 V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os,
                                            const OperandSize& operand_size);
-std::ostream& operator<<(std::ostream& os, const OperandType& operand_type);
+V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os,
+                                           const OperandType& operand_type);
 
 class BytecodeOperands {
  public: