The code of the methods `ZAddress::finalizable_good` and `ZAddress::mark_good`, shown below, can be simplified.

```
  const uintptr_t non_mark_bits_mask = ZPointerMarkMetadataMask ^ ZPointerAllMetadataMask;
  const uintptr_t non_mark_prev_bits = untype(prev) & non_mark_bits_mask;
  return color(addr, <other contents> | non_mark_prev_bits | ZPointerRememberedMask);
```


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