[heap] Use safer predicate for API functions.

src/heap/objects-visiting-inl.h

 // 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.
 
 #ifndef V8_OBJECTS_VISITING_INL_H_
 #define V8_OBJECTS_VISITING_INL_H_
 
 #include "src/heap/array-buffer-tracker.h"
 #include "src/heap/objects-visiting.h"
 #include "src/ic/ic-state.h"
@@ skipping 607 matching lines @@
     return false;
   }
 
   // The function must be compiled and have the source code available,
   // to be able to recompile it in case we need the function again.
   if (!(shared_info->is_compiled() && HasSourceCode(heap, shared_info))) {
     return false;
   }
 
   // We never flush code for API functions.
-  Object* function_data = shared_info->function_data();
-  if (function_data->IsFunctionTemplateInfo()) {
+  if (shared_info->IsApiFunction()) {
     return false;
   }
 
   // Only flush code for functions.
   if (shared_info->code()->kind() != Code::FUNCTION) {
     return false;
   }
 
   // Function must be lazy compilable.
   if (!shared_info->allows_lazy_compilation()) {
@@ skipping 84 matching lines @@
   typedef FlexibleBodyVisitor<StaticVisitor, JSFunction::BodyDescriptorWeakCode,
                               void> JSFunctionWeakCodeBodyVisitor;
   JSFunctionWeakCodeBodyVisitor::Visit(map, object);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_VISITING_INL_H_