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

src/objects.h

 // 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.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 7198 matching lines @@
     kBoundFunction,
     kIsAnonymous,
     kNameShouldPrintAsAnonymous,
     kIsFunction,
     kDontCache,
     kDontFlush,
     kIsArrow,
     kIsGenerator,
     kIsConciseMethod,
     kIsDefaultConstructor,
+    kIsSubclassConstructor,
     kIsAsmFunction,
     kDeserialized,
     kCompilerHintsCount  // Pseudo entry
   };
 
-  class FunctionKindBits : public BitField<FunctionKind, kIsArrow, 4> {};
+  class FunctionKindBits : public BitField<FunctionKind, kIsArrow, 5> {};
 
   class DeoptCountBits : public BitField<int, 0, 4> {};
   class OptReenableTriesBits : public BitField<int, 4, 18> {};
   class ICAgeBits : public BitField<int, 22, 8> {};
 
   class OptCountBits : public BitField<int, 0, 22> {};
   class DisabledOptimizationReasonBits : public BitField<int, 22, 8> {};
 
  private:
 #if V8_HOST_ARCH_32_BIT
@@ skipping 3741 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_