Implement implicit instance checks for API accessors.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 5ad67c98b3c1453518f8b0cd7fc14ad7f5cbe6ac..c841a804d930e12729eba703322c52ffb1a6ba50 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -3530,6 +3530,7 @@ ACCESSORS(AccessorInfo, setter, Object, kSetterOffset)
 ACCESSORS(AccessorInfo, data, Object, kDataOffset)
 ACCESSORS(AccessorInfo, name, Object, kNameOffset)
 ACCESSORS_TO_SMI(AccessorInfo, flag, kFlagOffset)
+ACCESSORS(AccessorInfo, compatible, Object, kCompatibleOffset)
 
 ACCESSORS(AccessorPair, getter, Object, kGetterOffset)
 ACCESSORS(AccessorPair, setter, Object, kSetterOffset)
@@ -4741,6 +4742,13 @@ void AccessorInfo::set_property_attributes(PropertyAttributes attributes) {
 }
 
 
+bool AccessorInfo::IsCompatibleReceiver(Object* receiver) {
+  Object* function_template = compatible();
+  if (!function_template->IsFunctionTemplateInfo()) return true;
+  return receiver->IsInstanceOf(FunctionTemplateInfo::cast(function_template));
+}
+
+
 template<typename Shape, typename Key>
 void Dictionary<Shape, Key>::SetEntry(int entry,
                                       Object* key,