Remove obsolete free-space checks from MarkCompactCollector.

src/mark-compact.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 2373 matching lines @@
   }
   ProcessMarkingDeque();
 }
 
 
 void MarkCompactCollector::ReattachInitialMaps() {
   HeapObjectIterator map_iterator(heap()->map_space());
   for (HeapObject* obj = map_iterator.Next();
        obj != NULL;
        obj = map_iterator.Next()) {
-    if (obj->IsFreeSpace()) continue;
     Map* map = Map::cast(obj);
 
     STATIC_ASSERT(LAST_TYPE == LAST_JS_RECEIVER_TYPE);
     if (map->instance_type() < FIRST_JS_RECEIVER_TYPE) continue;
 
     if (map->attached_to_shared_function_info()) {
       JSFunction::cast(map->constructor())->shared()->AttachInitialMap(map);
     }
   }
 }
 
 
 void MarkCompactCollector::ClearNonLiveReferences() {
-  HeapObjectIterator map_iterator(heap()->map_space());
   // Iterate over the map space, setting map transitions that go from
   // a marked map to an unmarked map to null transitions.  This action
   // is carried out only on maps of JSObjects and related subtypes.
+  HeapObjectIterator map_iterator(heap()->map_space());
   for (HeapObject* obj = map_iterator.Next();
-       obj != NULL; obj = map_iterator.Next()) {
-    Map* map = reinterpret_cast<Map*>(obj);
-    MarkBit map_mark = Marking::MarkBitFrom(map);
-    if (map->IsFreeSpace()) continue;
+       obj != NULL;
+       obj = map_iterator.Next()) {
+    Map* map = Map::cast(obj);
 
-    ASSERT(map->IsMap());
     if (!map->CanTransition()) continue;
 
-    if (map_mark.Get() &&
-        map->attached_to_shared_function_info()) {
+    MarkBit map_mark = Marking::MarkBitFrom(map);
+    if (map_mark.Get() && map->attached_to_shared_function_info()) {
       // This map is used for inobject slack tracking and has been detached
       // from SharedFunctionInfo during the mark phase.
       // Since it survived the GC, reattach it now.
       JSFunction::cast(map->constructor())->shared()->AttachInitialMap(map);
     }
 
     ClearNonLivePrototypeTransitions(map);
     ClearNonLiveMapTransitions(map, map_mark);
 
     if (map_mark.Get()) {
@@ skipping 1856 matching lines @@
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 
 
 } }  // namespace v8::internal