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//0x38 bytes (sizeof)
struct _HEAP_LFH_SUBSEGMENT_OWNER
{
    UCHAR IsBucket:1;                                                       //0x0
    UCHAR BucketIndex:7;                                                    //0x0
    union
    {
        UCHAR SlotCount;                                                    //0x1
        UCHAR AvailableSubsegmentCount;                                     //0x1
    };
    USHORT BucketRef;                                                       //0x2
    USHORT PrivateSlotMapRef;                                               //0x4
    USHORT HeatMapRef;                                                      //0x6
    union
    {
        struct _SINGLE_LIST_ENTRY OwnerFreeList;                            //0x8
        USHORT Spare:12;                                                    //0x8
    };
    union
    {
        ULONGLONG Lock;                                                     //0x10
        struct _SINGLE_LIST_ENTRY SlotStandbyEntry;                         //0x10
        struct
        {
            struct _HEAP_LFH_PTRREF_LIST PrivSlotListEntry;                 //0x10
            ULONG OwnerThreadId;                                            //0x14
        };
    };
    struct _LIST_ENTRY AvailableSubsegmentList;                             //0x18
    struct _LIST_ENTRY FullSubsegmentList;                                  //0x28
};