[cleanup] Remove dead code for handling pre-desugaring spread implementation

src/ast/ast.cc

Index: src/ast/ast.cc
diff --git a/src/ast/ast.cc b/src/ast/ast.cc
index 518cef15fbad7926d957090b79dc52ef8247358e..8be23cc8d08b82ae0c95db1f6c2bd3d05c246a56 100644
--- a/src/ast/ast.cc
+++ b/src/ast/ast.cc
@@ -649,8 +649,7 @@ void ArrayLiteral::AssignFeedbackVectorSlots(Isolate* isolate,
                                              FeedbackVectorSlotCache* cache) {
   // This logic that computes the number of slots needed for vector store
   // ics must mirror FullCodeGenerator::VisitArrayLiteral.
-  int array_index = 0;
-  for (; array_index < values()->length(); array_index++) {
+  for (int array_index = 0; array_index < values()->length(); array_index++) {
     Expression* subexpr = values()->at(array_index);
     DCHECK(!subexpr->IsSpread());
     if (CompileTimeValue::IsCompileTimeValue(subexpr)) continue;