Tag pointers to avoid node type byte about libart HOT 1 OPEN

/* Macros to manipulate pointer tags */
#define IS_LEAF(x) (((uintptr_t)x & 1))
#define SET_LEAF(x) ((void *)((uintptr_t)x | 1))
#define LEAF_RAW(x) ((artLeaf *)((void *)((uintptr_t)x & ~1ULL)))

#define MAX_PREFIX_LEN 14
typedef struct artNode {
    uint8_t partialLen; /* length of 'partial' (could be 4 bits, but less
                           efficient) */
    uint8_t type : 2;
    uint8_t childrenCount : 6;
    uint8_t partial[MAX_PREFIX_LEN];
} artNode;