In `ObjectStartArray::initialize`:

```
  ...
  MemTracker::record_virtual_memory_type((address)backing_store.base(), mtGC);

  _virtual_space.initialize(backing_store);

  _raw_base = (jbyte*)_virtual_space.low_boundary();
  ...
  MemTracker::record_virtual_memory_type((address)_raw_base, mtGC);
```

Inspecting the `_virtual_space.initialize` and `_virtual_space.low_boundary`, one can see `_raw_base == backing_store.base()`. Therefore, the second `record_virtual_memory_type` is redundant.