[interpreter] Bytecode register optimizer.

test/unittests/interpreter/bytecode-array-iterator-unittest.cc

Index: test/unittests/interpreter/bytecode-array-iterator-unittest.cc
diff --git a/test/unittests/interpreter/bytecode-array-iterator-unittest.cc b/test/unittests/interpreter/bytecode-array-iterator-unittest.cc
index b257c35c87a3868a4550c216319ebf47f1f383b3..9e2ea863bcbc1d01f1757e4c38989632a6e0b45c 100644
--- a/test/unittests/interpreter/bytecode-array-iterator-unittest.cc
+++ b/test/unittests/interpreter/bytecode-array-iterator-unittest.cc
@@ -47,6 +47,7 @@ TEST_F(BytecodeArrayIteratorTest, IteratesBytecodeArray) {
       .LoadLiteral(smi_1)
       .StoreAccumulatorInRegister(reg_1)
       .LoadAccumulatorWithRegister(reg_0)
+      .BinaryOperation(Token::Value::ADD, reg_0)
       .StoreAccumulatorInRegister(reg_1)
       .LoadNamedProperty(reg_1, name, feedback_slot)
       .BinaryOperation(Token::Value::ADD, reg_0)
@@ -156,6 +157,15 @@ TEST_F(BytecodeArrayIteratorTest, IteratesBytecodeArray) {
   offset += Bytecodes::Size(Bytecode::kLdar, OperandScale::kSingle);
   iterator.Advance();
 
+  CHECK_EQ(iterator.current_bytecode(), Bytecode::kAdd);
+  CHECK_EQ(iterator.current_offset(), offset);
+  CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);
+  CHECK_EQ(iterator.GetRegisterOperand(0).index(), reg_0.index());
+  CHECK_EQ(iterator.GetRegisterOperandRange(0), 1);
+  CHECK(!iterator.done());
+  offset += Bytecodes::Size(Bytecode::kStar, OperandScale::kSingle);
+  iterator.Advance();
+
   CHECK_EQ(iterator.current_bytecode(), Bytecode::kStar);
   CHECK_EQ(iterator.current_offset(), offset);
   CHECK_EQ(iterator.current_operand_scale(), OperandScale::kSingle);