[proxies] Make Object.prototype.isPrototypeOf work with proxies.

src/objects.cc

 // Copyright 2013 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/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 1265 matching lines @@
       PropertyDetails original_details = property_dictionary->DetailsAt(entry);
       int enumeration_index = original_details.dictionary_index();
       DCHECK(enumeration_index > 0);
       details = details.set_index(enumeration_index);
       property_dictionary->SetEntry(entry, name, value, details);
     }
   }
 }
 
 
-bool Object::HasInPrototypeChain(Isolate* isolate, Object* target) {
-  PrototypeIterator iter(isolate, this, PrototypeIterator::START_AT_RECEIVER);
+Maybe<bool> Object::HasInPrototypeChain(Isolate* isolate, Handle<Object> object,
+                                        Handle<Object> proto) {
+  PrototypeIterator iter(isolate, object, PrototypeIterator::START_AT_RECEIVER);
   while (true) {
-    iter.AdvanceIgnoringProxies();
-    if (iter.IsAtEnd()) return false;
-    if (iter.IsAtEnd(target)) return true;
+    if (!iter.AdvanceFollowingProxies()) return Nothing<bool>();
+    if (iter.IsAtEnd()) return Just(false);
+    if (iter.IsAtEnd(proto)) return Just(true);
   }
 }
 
 
 Map* Object::GetRootMap(Isolate* isolate) {
   DisallowHeapAllocation no_alloc;
   if (IsSmi()) {
     Context* native_context = isolate->context()->native_context();
     return native_context->number_function()->initial_map();
   }
@@ skipping 17767 matching lines @@
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 
 }  // namespace internal
 }  // namespace v8