Revert of Refactor SharedFunctionInfo::IsBuiltin.

src/ic/ic.cc

 // 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.
 
 #include "src/ic/ic.h"
 
 #include <iostream>
 
 #include "src/accessors.h"
 #include "src/api-arguments-inl.h"
@@ skipping 1015 matching lines @@
     Handle<Object> getter(Handle<AccessorPair>::cast(accessors)->getter(),
                           isolate);
     if (!getter->IsJSFunction() && !getter->IsFunctionTemplateInfo()) {
       return false;
     }
     Handle<JSObject> holder = lookup->GetHolder<JSObject>();
     Handle<Object> receiver = lookup->GetReceiver();
     if (holder->HasFastProperties()) {
       if (getter->IsJSFunction()) {
         Handle<JSFunction> function = Handle<JSFunction>::cast(getter);
-        if (!receiver->IsJSObject() && function->shared()->IsUserJavaScript() &&
+        if (!receiver->IsJSObject() && !function->shared()->IsBuiltin() &&
             is_sloppy(function->shared()->language_mode())) {
           // Calling sloppy non-builtins with a value as the receiver
           // requires boxing.
           return false;
         }
       }
       CallOptimization call_optimization(getter);
       if (call_optimization.is_simple_api_call() &&
           !call_optimization.IsCompatibleReceiverMap(receiver_map, holder)) {
         return false;
@@ skipping 2193 matching lines @@
     DCHECK_EQ(LookupIterator::INTERCEPTOR, it.state());
     it.Next();
     ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
                                        Object::GetProperty(&it));
   }
 
   return *result;
 }
 }  // namespace internal
 }  // namespace v8