Fields
- count: s64
- bytes: s64
- allocations_since_last_visualizer_update: s64
- bytes_allocated_since_last_visualizer_update: s64
- alloc_site_trace: *Packed_Stack_Trace
- allocator_proc: Allocator_Proc
- group_info: *Group_Info
- child_count: s64
- child_bytes: s64