new classes: special construct stub for derived classs and TDZ for `this`.

src/preparser.cc

Index: src/preparser.cc
diff --git a/src/preparser.cc b/src/preparser.cc
index 4d621c2dd9004c0a2b3434a8be2e561b42cfc1ee..ede3e0a35c1bbc0c3a0e417db4ed5fc6f3e76629 100644
--- a/src/preparser.cc
+++ b/src/preparser.cc
@@ -979,8 +979,10 @@ PreParserExpression PreParser::ParseClassLiteral(
   scope_->SetStrictMode(STRICT);
   scope_->SetScopeName(name);
 
+  bool has_extends = false;
   if (Check(Token::EXTENDS)) {
     ParseLeftHandSideExpression(CHECK_OK);
+    has_extends = true;
   }
 
   bool has_seen_constructor = false;
@@ -992,8 +994,8 @@ PreParserExpression PreParser::ParseClassLiteral(
     const bool is_static = false;
     bool is_computed_name = false;  // Classes do not care about computed
                                     // property names here.
-    ParsePropertyDefinition(NULL, in_class, is_static, &is_computed_name,
-                            &has_seen_constructor, CHECK_OK);
+    ParsePropertyDefinition(NULL, in_class, is_static, has_extends,
+                            &is_computed_name, &has_seen_constructor, CHECK_OK);
   }
 
   Expect(Token::RBRACE, CHECK_OK);