Fix tracking of computed fields when field type tracking is disabled.

src/objects.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 45 matching lines @@
 #ifdef ENABLE_DISASSEMBLER
 #include "disasm.h"
 #include "disassembler.h"
 #endif
 
 namespace v8 {
 namespace internal {
 
 Handle<HeapType> Object::OptimalType(Isolate* isolate,
                                      Representation representation) {
+  if (representation.IsNone()) return HeapType::None(isolate);
   if (FLAG_track_field_types) {
-    if (representation.IsNone()) return HeapType::None(isolate);
     if (representation.IsHeapObject() && IsHeapObject()) {
       // We can track only JavaScript objects with stable maps.
       Handle<Map> map(HeapObject::cast(this)->map(), isolate);
       if (map->is_stable() &&
           map->instance_type() >= FIRST_NONCALLABLE_SPEC_OBJECT_TYPE &&
           map->instance_type() <= LAST_NONCALLABLE_SPEC_OBJECT_TYPE) {
         return HeapType::Class(map, isolate);
       }
     }
   }
@@ skipping 17354 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal