[AST] Add method to concatenate AstRawStrings

src/parsing/preparser.cc

Index: src/parsing/preparser.cc
diff --git a/src/parsing/preparser.cc b/src/parsing/preparser.cc
index 8eb11366653576f3e68dbec44ec5813d4e59db0d..f0fee8f3e9ba892f9966b12f15243dd9d9d910e0 100644
--- a/src/parsing/preparser.cc
+++ b/src/parsing/preparser.cc
@@ -854,11 +854,13 @@ PreParserExpression PreParser::ParseClassLiteral(
   Expect(Token::LBRACE, CHECK_OK);
   while (peek() != Token::RBRACE) {
     if (Check(Token::SEMICOLON)) continue;
+    IdentifierT private_name;
     bool is_computed_name = false;  // Classes do not care about computed
                                     // property names here.
     ExpressionClassifier property_classifier(this);
-    ParseClassPropertyDefinition(&checker, has_extends, &is_computed_name,
-                                 &has_seen_constructor, CHECK_OK);
+    ParseClassPropertyDefinition(&checker, has_extends, &private_name,
+                                 &is_computed_name, &has_seen_constructor,
+                                 CHECK_OK);
     ValidateExpression(CHECK_OK);
     impl()->AccumulateFormalParameterContainmentErrors();
   }
@@ -902,6 +904,15 @@ PreParserExpression PreParser::ParseDoExpression(bool* ok) {
   return PreParserExpression::Default();
 }
 
+PreParserExpression PreParser::ParsePrivateFieldReference(
+    PreParserExpression base, bool* ok) {
+  // PrimaryExpression ::
+  //     PrivateName
+  Expect(Token::HASH, CHECK_OK);
+  ParseIdentifierName(CHECK_OK);
+  return PreParserExpression::Property();
+}
+
 void PreParser::ParseAsyncArrowSingleExpressionBody(PreParserStatementList body,
                                                     bool accept_IN, int pos,
                                                     bool* ok) {