Reduce the memory footprint of expression classifiers

src/parsing/preparser.h

Index: src/parsing/preparser.h
diff --git a/src/parsing/preparser.h b/src/parsing/preparser.h
index 22432baca920084ca74038bfb24c1bdef7834c21..5cef1bcd5672d14a2101db732298e45b83c76421 100644
--- a/src/parsing/preparser.h
+++ b/src/parsing/preparser.h
@@ -934,6 +934,8 @@ class PreParserTraits {
   inline void RewriteNonPattern(Type::ExpressionClassifier* classifier,
                                 bool* ok);
 
+  V8_INLINE ZoneList<typename Type::ExpressionClassifier::Error>*
+      GetReportedErrorList() const;
   V8_INLINE Zone* zone() const;
   V8_INLINE ZoneList<PreParserExpression>* GetNonPatternList() const;
 
@@ -1127,6 +1129,12 @@ void PreParserTraits::RewriteNonPattern(Type::ExpressionClassifier* classifier,
 }
 
 
+ZoneList<typename PreParserTraits::Type::ExpressionClassifier::Error>*
+PreParserTraits::GetReportedErrorList() const {
+  return pre_parser_->function_state_->GetReportedErrorList();
+}
+
+
 Zone* PreParserTraits::zone() const {
   return pre_parser_->function_state_->scope()->zone();
 }