Revert of Refactor SharedFunctionInfo::IsBuiltin.

src/objects.cc

 // 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.
 
 #include "src/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <memory>
 #include <sstream>
@@ skipping 13277 matching lines @@
   return isolate->factory()->NewStringFromAsciiChecked(kNativeCodeSource);
 }
 
 
 // static
 Handle<String> JSFunction::ToString(Handle<JSFunction> function) {
   Isolate* const isolate = function->GetIsolate();
   Handle<SharedFunctionInfo> shared_info(function->shared(), isolate);
 
   // Check if {function} should hide its source code.
-  if (!shared_info->IsUserJavaScript()) {
+  if (!shared_info->script()->IsScript() ||
+      Script::cast(shared_info->script())->hide_source()) {
     return NativeCodeFunctionSourceString(shared_info);
   }
 
   // Check if we should print {function} as a class.
   Handle<Object> class_start_position = JSReceiver::GetDataProperty(
       function, isolate->factory()->class_start_position_symbol());
   if (class_start_position->IsSmi()) {
     Handle<Object> class_end_position = JSReceiver::GetDataProperty(
         function, isolate->factory()->class_end_position_symbol());
     Handle<String> script_source(
@@ skipping 7090 matching lines @@
       // depend on this.
       return DICTIONARY_ELEMENTS;
     }
     DCHECK_LE(kind, LAST_ELEMENTS_KIND);
     return kind;
   }
 }
 
 }  // namespace internal
 }  // namespace v8