Set up rewriting triggers

src/parsing/preparser.h

Index: src/parsing/preparser.h
diff --git a/src/parsing/preparser.h b/src/parsing/preparser.h
index 66a55cef078c294a014785332b990ff3682b8a07..9cb64269a38a6a33117b445a83b3a42766e47a8e 100644
--- a/src/parsing/preparser.h
+++ b/src/parsing/preparser.h
@@ -938,7 +938,7 @@ class PreParserTraits {
   void SetFunctionNameFromPropertyName(PreParserExpression,
                                        PreParserIdentifier) {}
 
-  inline PreParserExpression RewriteExpression(
+  inline PreParserExpression RewriteNonPattern(
       PreParserExpression expr, const ExpressionClassifier* classifier,
       bool* ok);
   inline PreParserExpression RewriteObjectLiteralProperty(
@@ -1126,7 +1126,7 @@ PreParserExpression PreParserTraits::ParseDoExpression(bool* ok) {
 }
 
 
-PreParserExpression PreParserTraits::RewriteExpression(
+PreParserExpression PreParserTraits::RewriteNonPattern(
     PreParserExpression expr, const ExpressionClassifier* classifier,
     bool* ok) {
   pre_parser_->ValidateExpression(classifier, ok);