mte_get_tag_address
new_tag = MT_FETCH_TAG((uintptr_t)(mte_get_tag_address(ptr + i)));
child_tag = MT_FETCH_TAG((uintptr_t)(mte_get_tag_address(ptr + i)));
child_tag = MT_FETCH_TAG((uintptr_t)(mte_get_tag_address(ptr + i)));
void *mte_get_tag_address(void *ptr);