Classes: Fix issue with default constructor crash

src/ast.h

Index: src/ast.h
diff --git a/src/ast.h b/src/ast.h
index aa23b4e237afa7602613a5b6a151adf0c5536608..48f8fac79406246cc6e0d44b38a7df6372b25140 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -3622,6 +3622,31 @@ class AstNodeFactory FINAL BASE_EMBEDDED {
     VISIT_AND_RETURN(ClassLiteral, lit)
   }
 
+  FunctionLiteral* NewDefaultConstructor(const AstRawString* name,
+                                         AstValueFactory* ast_value_factory,
+                                         Scope* scope, int position) {
+    ZoneList<Statement*>* body = new(zone_) ZoneList<Statement*>(0, zone_);
+    int materialized_literal_count = 0;
+    int expected_property_count = 0;
+    int handler_count = 0;
+    int parameter_count = 0;
+
+    FunctionLiteral::FunctionType function_type =
+        FunctionLiteral::NAMED_EXPRESSION;
+    if (name == NULL) {
+      name = ast_value_factory->empty_string();
+      function_type = FunctionLiteral::ANONYMOUS_EXPRESSION;
+    }
+
+    return NewFunctionLiteral(name, ast_value_factory, scope, body,
+        materialized_literal_count, expected_property_count, handler_count,
+        parameter_count, FunctionLiteral::kNoDuplicateParameters,
+        FunctionLiteral::ANONYMOUS_EXPRESSION, FunctionLiteral::kIsFunction,
+        FunctionLiteral::kNotParenthesized, FunctionKind::kNormalFunction,
+        position);
+  }
+
+
   NativeFunctionLiteral* NewNativeFunctionLiteral(const AstRawString* name,
                                                   v8::Extension* extension,
                                                   int pos) {