Get rid of distinction between below- and above-watermark in page allocation....

src/serialize.cc

 // Copyright 2006-2008 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 699 matching lines @@
 void Deserializer::VisitPointers(Object** start, Object** end) {
   // The space must be new space.  Any other space would cause ReadChunk to try
   // to update the remembered using NULL as the address.
   ReadChunk(start, end, NEW_SPACE, NULL);
 }
 
 
 // This routine writes the new object into the pointer provided and then
 // returns true if the new object was in young space and false otherwise.
 // The reason for this strange interface is that otherwise the object is
-// written very late, which means the ByteArray map is not set up by the
-// time we need to use it to mark the space at the end of a page free (by
-// making it into a byte array).
+// written very late, which means the FreeSpace map is not set up by the
+// time we need to use it to mark the space at the end of a page free.
 void Deserializer::ReadObject(int space_number,
                               Space* space,
                               Object** write_back) {
   int size = source_->GetInt() << kObjectAlignmentBits;
   Address address = Allocate(space_number, space, size);
   *write_back = HeapObject::FromAddress(address);
   Object** current = reinterpret_cast<Object**>(address);
   Object** limit = current + (size >> kPointerSizeLog2);
   if (FLAG_log_snapshot_positions) {
     LOG(SnapshotPositionEvent(address, source_->position()));
@@ skipping 809 matching lines @@
       fullness_[space] = RoundUp(fullness_[space], Page::kPageSize);
     }
   }
   int allocation_address = fullness_[space];
   fullness_[space] = allocation_address + size;
   return allocation_address;
 }
 
 
 } }  // namespace v8::internal