[Interpreter] Add support for calling runtime functions which return a pair.

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 344fbc3ab269ea6317f3e36da1385980d465cf3d..d09d72f01a2142b600970ef88fb08b27a81abf47 100644
--- a/src/interpreter/bytecode-array-iterator.cc
+++ b/src/interpreter/bytecode-array-iterator.cc
@@ -88,6 +88,7 @@ Register BytecodeArrayIterator::GetRegisterOperand(int operand_index) const {
   OperandType operand_type =
       Bytecodes::GetOperandType(current_bytecode(), operand_index);
   DCHECK(operand_type == OperandType::kReg8 ||
+         operand_type == OperandType::kRegPair8 ||
          operand_type == OperandType::kMaybeReg8 ||
          operand_type == OperandType::kReg16);
   uint32_t operand = GetRawOperand(operand_index, operand_type);