Min version	8.1	10 Pre RTM
Max version	8.1 Update 1	10 TH2
x64 offset offset:bitpos	Field Name
0x0000	uint8_t BucketIndex	uint8_t IsBucket
0x0000:0x01		uint8_t Spare0
0x0001	uint8_t IsBucket	uint8_t BucketIndex
0x0002	uint16_t SlotIndex	uint8_t SlotCount
0x0002	uint8_t AffinitySlotMask	uint8_t SlotIndex
0x0003	uint8_t Spare	uint8_t Spare1
0x0008	uint64_t AvailableSubsegmentCount
0x0010	struct _RTL_SRWLOCK Lock
0x0018	struct _LIST_ENTRY AvailableSubsegmentList
0x0028	struct _LIST_ENTRY FullSubsegmentList