[Interpreter] Add CallRuntime support to the interpreter.

src/interpreter/bytecode-array-iterator.cc

Index: src/interpreter/bytecode-array-iterator.cc
diff --git a/src/interpreter/bytecode-array-iterator.cc b/src/interpreter/bytecode-array-iterator.cc
index d4f277307936b0eab5fe56617f1469bd90ee44f0..a049572170d4267fc464558eb55d28f35e899d92 100644
--- a/src/interpreter/bytecode-array-iterator.cc
+++ b/src/interpreter/bytecode-array-iterator.cc
@@ -59,6 +59,12 @@ int8_t BytecodeArrayIterator::GetImmediateOperand(int operand_index) const {
 }
 
 
+int BytecodeArrayIterator::GetCountOperand(int operand_index) const {
+  uint32_t operand = GetRawOperand(operand_index, OperandType::kCount8);
+  return static_cast<int>(operand);
+}
+
+
 int BytecodeArrayIterator::GetIndexOperand(int operand_index) const {
   OperandSize size =
       Bytecodes::GetOperandSize(current_bytecode(), operand_index);