Read zone() directly from parser_ in ParserTraits

src/parsing/parser.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/parsing/parser.h"
 
 #include <memory>
 
 #include "src/api.h"
 #include "src/ast/ast.h"
@@ skipping 5841 matching lines @@
 ZoneList<Expression*>* ParserTraits::GetNonPatternList() const {
   return parser_->function_state_->non_patterns_to_rewrite();
 }
 
 
 ZoneList<typename ParserTraits::Type::ExpressionClassifier::Error>*
 ParserTraits::GetReportedErrorList() const {
   return parser_->function_state_->GetReportedErrorList();
 }
 
-
-Zone* ParserTraits::zone() const {
-  return parser_->function_state_->scope()->zone();
-}
-
+Zone* ParserTraits::zone() const { return parser_->zone(); }
 
 class NonPatternRewriter : public AstExpressionRewriter {
  public:
   NonPatternRewriter(uintptr_t stack_limit, Parser* parser)
       : AstExpressionRewriter(stack_limit), parser_(parser) {}
   ~NonPatternRewriter() override {}
 
  private:
   bool RewriteExpression(Expression* expr) override {
     if (expr->IsRewritableExpression()) return true;
@@ skipping 1226 matching lines @@
   node->Print(Isolate::Current());
 }
 #endif  // DEBUG
 
 #undef CHECK_OK
 #undef CHECK_OK_VOID
 #undef CHECK_FAILED
 
 }  // namespace internal
 }  // namespace v8