Revert of Always give class literals a block scope

src/parser.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/parser.h"
 
 #include "src/api.h"
 #include "src/ast.h"
 #include "src/ast-literal-reindexer.h"
 #include "src/bailout-reason.h"
@@ skipping 4877 matching lines @@
   }
 
   Expect(Token::RBRACE, CHECK_OK);
   int end_pos = scanner()->location().end_pos;
 
   if (constructor == NULL) {
     constructor = DefaultConstructor(extends != NULL, block_scope, pos, end_pos,
                                      block_scope->language_mode());
   }
 
-  // Note that we do not finalize this block scope because strong
-  // mode uses it as a sentinel value indicating an anonymous class.
   block_scope->set_end_position(end_pos);
 
   if (name != NULL) {
     DCHECK_NOT_NULL(proxy);
     proxy->var()->set_initializer_position(end_pos);
+  } else {
+    // Unnamed classes should not have scopes (the scope will be empty).
+    DCHECK_EQ(block_scope->num_var_or_const(), 0);
+    block_scope = nullptr;
   }
 
   return factory()->NewClassLiteral(name, block_scope, proxy, extends,
                                     constructor, properties, pos, end_pos);
 }
 
 
 Expression* Parser::ParseV8Intrinsic(bool* ok) {
   // CallRuntime ::
   //   '%' Identifier Arguments
@@ skipping 1446 matching lines @@
 
 Expression* Parser::SpreadCallNew(Expression* function,
                                   ZoneList<v8::internal::Expression*>* args,
                                   int pos) {
   args->InsertAt(0, function, zone());
 
   return factory()->NewCallRuntime(Context::REFLECT_CONSTRUCT_INDEX, args, pos);
 }
 }  // namespace internal
 }  // namespace v8