Merge experimental/gc branch to the bleeding_edge.

src/serialize.h

 // Copyright 2006-2009 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 220 matching lines @@
   static void SetSnapshotCacheSize(int size);
 
  protected:
   // Where the pointed-to object can be found:
   enum Where {
     kNewObject = 0,                 // Object is next in snapshot.
     // 1-8                             One per space.
     kRootArray = 0x9,               // Object is found in root array.
     kPartialSnapshotCache = 0xa,    // Object is in the cache.
     kExternalReference = 0xb,       // Pointer to an external reference.
-    // 0xc-0xf                         Free.
+    kSkip = 0xc,                    // Skip a pointer sized cell.
+    // 0xd-0xf                         Free.
     kBackref = 0x10,                 // Object is described relative to end.
     // 0x11-0x18                       One per space.
     // 0x19-0x1f                       Common backref offsets.
     kFromStart = 0x20,              // Object is described relative to start.
     // 0x21-0x28                       One per space.
     // 0x29-0x2f                       Free.
     // 0x30-0x3f                       Used by misc tags below.
     kPointedToMask = 0x3f
   };
 
@@ skipping 375 matching lines @@
   virtual int RootIndex(HeapObject* o) { return kInvalidRootIndex; }
   virtual bool ShouldBeInThePartialSnapshotCache(HeapObject* o) {
     return false;
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SERIALIZE_H_