PreParsing inner functions: Fix declaration-only variables, part 2.

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index 6b21a6fe50009f62dc674e1f3b98af87d6bb44d7..af152ca4c10fadd38a694a00ded182396a24aaa5 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -124,6 +124,7 @@ class DiscardableZoneScope {
       parser_->zone_ = temp_zone;
       if (parser_->reusable_preparser_ != nullptr) {
         parser_->reusable_preparser_->zone_ = temp_zone;
+        parser_->reusable_preparser_->factory()->set_zone(temp_zone);
       }
     }
   }
@@ -132,6 +133,7 @@ class DiscardableZoneScope {
     parser_->zone_ = prev_zone_;
     if (parser_->reusable_preparser_ != nullptr) {
       parser_->reusable_preparser_->zone_ = prev_zone_;
+      parser_->reusable_preparser_->factory()->set_zone(prev_zone_);
     }
     ast_node_factory_scope_.Reset();
   }