Always give class literals a block scope

src/ast.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_AST_H_
 #define V8_AST_H_
 
 #include "src/assembler.h"
 #include "src/ast-value-factory.h"
 #include "src/bailout-reason.h"
@@ skipping 2644 matching lines @@
   // Unlike other AST nodes, this number of bailout IDs allocated for an
   // ClassLiteral can vary, so num_ids() is not a static method.
   int num_ids() const { return parent_num_ids() + 4 + properties()->length(); }
 
   // Object literals need one feedback slot for each non-trivial value, as well
   // as some slots for home objects.
   void AssignFeedbackVectorSlots(Isolate* isolate, FeedbackVectorSpec* spec,
                                  FeedbackVectorSlotCache* cache) override;
 
   bool NeedsProxySlot() const {
-    return FLAG_vector_stores && scope() != NULL &&
+    return FLAG_vector_stores && class_variable_proxy() != nullptr &&
            class_variable_proxy()->var()->IsUnallocated();
   }
 
   FeedbackVectorSlot ProxySlot() const { return slot_; }
 
  protected:
   ClassLiteral(Zone* zone, const AstRawString* name, Scope* scope,
                VariableProxy* class_variable_proxy, Expression* extends,
                FunctionLiteral* constructor, ZoneList<Property*>* properties,
                int start_position, int end_position)
@@ skipping 957 matching lines @@
   // the parser-level zone.
   Zone* parser_zone_;
   AstValueFactory* ast_value_factory_;
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_AST_H_