Switch transition zapping to slower version.

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 9913 matching lines @@
   cache->set(header + last * step + kProtoTransitionPrototypeOffset, prototype);
   cache->set(header + last * step + kProtoTransitionMapOffset, map);
   SetNumberOfProtoTransitions(transitions);
 
   return cache;
 }
 
 
 void Map::ZapTransitions() {
   TransitionArray* transition_array = transitions();
-  MemsetPointer(transition_array->data_start(),
-                GetHeap()->the_hole_value(),
-                transition_array->length());
+  // TODO(mstarzinger): Temporarily use a slower version instead of the faster
+  // MemsetPointer to investigate a crasher. Switch back to MemsetPointer.
+  Object** data = transition_array->data_start();
+  Object* the_hole = GetHeap()->the_hole_value();
+  int length = transition_array->length();
+  for (int i = 0; i < length; i++) {
+    data[i] = the_hole;
+  }
 }
 
 
 void Map::ZapPrototypeTransitions() {
   FixedArray* proto_transitions = GetPrototypeTransitions();
   MemsetPointer(proto_transitions->data_start(),
                 GetHeap()->the_hole_value(),
                 proto_transitions->length());
 }
 
@@ skipping 4566 matching lines @@
   set_year(Smi::FromInt(year), SKIP_WRITE_BARRIER);
   set_month(Smi::FromInt(month), SKIP_WRITE_BARRIER);
   set_day(Smi::FromInt(day), SKIP_WRITE_BARRIER);
   set_weekday(Smi::FromInt(weekday), SKIP_WRITE_BARRIER);
   set_hour(Smi::FromInt(hour), SKIP_WRITE_BARRIER);
   set_min(Smi::FromInt(min), SKIP_WRITE_BARRIER);
   set_sec(Smi::FromInt(sec), SKIP_WRITE_BARRIER);
 }
 
 } }  // namespace v8::internal