Propagate not-found on proxy target to GetRealNamedProperty

src/objects.h

 // Copyright 2015 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/assert-scope.h"
@@ skipping 9664 matching lines @@
       PropertyDescriptor* desc, ShouldThrow should_throw);
 
   // ES6 9.5.7
   MUST_USE_RESULT static Maybe<bool> HasProperty(Isolate* isolate,
                                                  Handle<JSProxy> proxy,
                                                  Handle<Name> name);
 
   // ES6 9.5.8
   MUST_USE_RESULT static MaybeHandle<Object> GetProperty(
       Isolate* isolate, Handle<JSProxy> proxy, Handle<Name> name,
-      Handle<Object> receiver);
+      Handle<Object> receiver, bool* was_found);
 
   // ES6 9.5.9
   MUST_USE_RESULT static Maybe<bool> SetProperty(Handle<JSProxy> proxy,
                                                  Handle<Name> name,
                                                  Handle<Object> value,
                                                  Handle<Object> receiver,
                                                  LanguageMode language_mode);
 
   // ES6 9.5.10 (when passed SLOPPY)
   MUST_USE_RESULT static Maybe<bool> DeletePropertyOrElement(
@@ skipping 1094 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_