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//0x8 bytes (sizeof)
struct _HEAP_VS_CHUNK_HEADER
{
    union _HEAP_VS_CHUNK_HEADER_SIZE Sizes;                                 //0x0
    union
    {
        struct
        {
            ULONG EncodedSegmentPageOffset:8;                               //0x4
            ULONG UnusedBytes:1;                                            //0x4
            ULONG SkipDuringWalk:1;                                         //0x4
            ULONG Spare:22;                                                 //0x4
        };
        ULONG AllocatedChunkBits;                                           //0x4
    };
};