Question about `IsGCActiveMark`

[Guoxiong Li]

Hi all,

The `IsGCActiveMark` is used by other GCs except SerialGC. In
`SerialHeap::do_collection`, the statement shown below implements the same
feature as `IsGCActiveMark`.

```
AutoModifyRestore<bool> temporarily(_is_gc_active, true);
```

Should we adjust the SerialGC to use `IsGCActiveMark`?

Best Regards,
-- Guoxiong
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