Remove all uses of field-tracking flags that do not make decisions but are subject to existing info…

src/runtime.cc

 // Copyright 2012 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 4932 matching lines @@
               : value;
         }
         // Lookup cache miss.  Perform lookup and update the cache if
         // appropriate.
         LookupResult result(isolate);
         receiver->LocalLookup(key, &result);
         if (result.IsField()) {
           int offset = result.GetFieldIndex().field_index();
           // Do not track double fields in the keyed lookup cache. Reading
           // double values requires boxing.
-          if (!FLAG_track_double_fields ||
-              !result.representation().IsDouble()) {
+          if (!result.representation().IsDouble()) {
             keyed_lookup_cache->Update(receiver_map, key, offset);
           }
           return receiver->FastPropertyAt(result.representation(), offset);
         }
       } else {
         // Attempt dictionary lookup.
         NameDictionary* dictionary = receiver->property_dictionary();
         int entry = dictionary->FindEntry(key);
         if ((entry != NameDictionary::kNotFound) &&
             (dictionary->DetailsAt(entry).type() == NORMAL)) {
@@ skipping 10000 matching lines @@
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     isolate->counters()->gc_last_resort_from_js()->Increment();
     isolate->heap()->CollectAllGarbage(Heap::kNoGCFlags,
                                        "Runtime::PerformGC");
   }
 }
 
 
 } }  // namespace v8::internal