`G1FullGCPrepareTask::G1CalculatePointersClosure::do_heap_region` contains the following structure:

```
if (is_humongous) {
} else if (is_open_archive()) {
} else if (is_closed_archive()) {
} else {
}
```

The verification in `G1ResetSkipCompactingClosure` basically checks whether skip-compacting regions actually meet the criteria to skip compaction.

To make the code more straightforward, it should mirror the original structure as well, instead of a single assert.