5179 remove unused ZFS ARC functions

@@ -1308,27 +1308,10 @@
         ARCSTAT_INCR(arcstat_meta_used, -space);
         ASSERT(arc_size >= space);
         atomic_add_64(&arc_size, -space);
 }
 
-void *
-arc_data_buf_alloc(uint64_t size)
-{
-        if (arc_evict_needed(ARC_BUFC_DATA))
-                cv_signal(&arc_reclaim_thr_cv);
-        atomic_add_64(&arc_size, size);
-        return (zio_data_buf_alloc(size));
-}
-
-void
-arc_data_buf_free(void *buf, uint64_t size)
-{
-        zio_data_buf_free(buf, size);
-        ASSERT(arc_size >= size);
-        atomic_add_64(&arc_size, -size);
-}
-
 arc_buf_t *
 arc_buf_alloc(spa_t *spa, int size, void *tag, arc_buf_contents_t type)
 {
         arc_buf_hdr_t *hdr;
         arc_buf_t *buf;