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

src/ast/ast.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/ast/ast.h"
 
 #include <cmath>  // For isfinite.
 
 #include "src/ast/compile-time-value.h"
 #include "src/ast/prettyprinter.h"
@@ skipping 631 matching lines @@
   set_is_simple(is_simple);
   set_depth(depth_acc);
 }
 
 
 void ArrayLiteral::AssignFeedbackVectorSlots(Isolate* isolate,
                                              FeedbackVectorSpec* spec,
                                              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;
 
     // We'll reuse the same literal slot for all of the non-constant
     // subexpressions that use a keyed store IC.
     literal_slot_ = spec->AddKeyedStoreICSlot();
     return;
   }
 }
@@ skipping 295 matching lines @@
 // static
 bool Literal::Match(void* literal1, void* literal2) {
   const AstValue* x = static_cast<Literal*>(literal1)->raw_value();
   const AstValue* y = static_cast<Literal*>(literal2)->raw_value();
   return (x->IsString() && y->IsString() && x->AsString() == y->AsString()) ||
          (x->IsNumber() && y->IsNumber() && x->AsNumber() == y->AsNumber());
 }
 
 }  // namespace internal
 }  // namespace v8