Ensure slow properties for simple {__proto__:null} literals.

src/parsing/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/parsing/parser.h"
 
 #include <memory>
 
 #include "src/api.h"
 #include "src/ast/ast-expression-rewriter.h"
@@ skipping 4100 matching lines @@
 void Parser::SetFunctionNameFromPropertyName(ObjectLiteralProperty* property,
                                              const AstRawString* name) {
   DCHECK(property->kind() != ObjectLiteralProperty::GETTER);
   DCHECK(property->kind() != ObjectLiteralProperty::SETTER);
 
   // Computed name setting must happen at runtime.
   DCHECK(!property->is_computed_name());
 
   // Ignore "__proto__" as a name when it's being used to set the [[Prototype]]
   // of an object literal.
-  if (property->kind() == ObjectLiteralProperty::PROTOTYPE) return;
+  if (property->IsPrototype()) return;
 
   Expression* value = property->value();
 
   DCHECK(!value->IsAnonymousFunctionDefinition() ||
          property->kind() == ObjectLiteralProperty::COMPUTED);
   SetFunctionName(value, name);
 }
 
 void Parser::SetFunctionNameFromIdentifierRef(Expression* value,
                                               Expression* identifier) {
@@ skipping 916 matching lines @@
 
   return final_loop;
 }
 
 #undef CHECK_OK
 #undef CHECK_OK_VOID
 #undef CHECK_FAILED
 
 }  // namespace internal
 }  // namespace v8