Classes: Fix issue with default constructor crash

src/full-codegen.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/ast.h"
 #include "src/ast-numbering.h"
 #include "src/code-factory.h"
 #include "src/codegen.h"
@@ skipping 1560 matching lines @@
 
   if (lit->extends() != NULL) {
     VisitForStackValue(lit->extends());
   } else {
     __ Push(isolate()->factory()->the_hole_value());
   }
 
   if (lit->constructor() != NULL) {
     VisitForStackValue(lit->constructor());
   } else {
-    __ Push(isolate()->factory()->undefined_value());
+    Handle<JSFunction> default_constructor =
+        lit->extends() == NULL ? isolate()->default_constructor_no_super()
+                               : isolate()->default_constructor();
+    Handle<SharedFunctionInfo> shared(default_constructor->shared());
+    EmitNewClosure(shared, false);
+    __ Push(result_register());
   }
 
   __ Push(script());
   __ Push(Smi::FromInt(lit->start_position()));
   __ Push(Smi::FromInt(lit->end_position()));
 
   __ CallRuntime(Runtime::kDefineClass, 6);
   EmitClassDefineProperties(lit);
 
   context()->Plug(result_register());
@@ skipping 159 matching lines @@
   }
   return true;
 }
 #endif  // DEBUG
 
 
 #undef __
 
 
 } }  // namespace v8::internal