[interpreter] Use VisitForTest for loop conditions

src/interpreter/bytecode-label.cc

Index: src/interpreter/bytecode-label.cc
diff --git a/src/interpreter/bytecode-label.cc b/src/interpreter/bytecode-label.cc
index c5c36f90ec4a9d5286b827e64053b62930354799..a12e8ab4cc8ae077c7fa4fdb0c47466b115d5518 100644
--- a/src/interpreter/bytecode-label.cc
+++ b/src/interpreter/bytecode-label.cc
@@ -11,16 +11,24 @@ namespace internal {
 namespace interpreter {
 
 BytecodeLabel* BytecodeLabels::New() {
+  DCHECK(!is_bound());
   labels_.push_back(BytecodeLabel());
   return &labels_.back();
 }
 
 void BytecodeLabels::Bind(BytecodeArrayBuilder* builder) {
-  for (auto label : labels_) {
+  for (auto& label : labels_) {
     builder->Bind(&label);
   }
 }
 
+void BytecodeLabels::BindToLabel(BytecodeArrayBuilder* builder,
+                                 const BytecodeLabel& target) {
+  for (auto& label : labels_) {
+    builder->Bind(target, &label);
+  }
+}
+
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8