65   struct DataDescriptor_64 {  struct in lldb_private::formatters::NSSetISyntheticFrontEnd
66     uint64_t _used : 58;
67     uint32_t _szidx : 6;
152   struct DataDescriptor_64 {  struct
153     uint64_t _used : 58;
154     uint64_t _size;
155     uint64_t _mutations;
156     uint64_t _objs_addr;
171   struct DataDescriptor_64 {  struct
172     uint64_t _used : 58;
173     uint64_t _size;
174     uint64_t _objs_addr;
175     uint64_t _mutations;
192   struct DataDescriptor_64 {  struct
193     uint64_t _cow;
195     uint64_t _objs_addr;
196     uint32_t _muts;
197     uint32_t _used : 26;
198     uint32_t _szidx : 6;