branches/zip rb://159

In case of pages that are not made young the counter is incremented
only when the page in question is 'old'. In case of pages that are
made young the counter is incremented in case of all pages. For apple
to apple comparison this patch changes the 'young-making' counter to
consider only 'old' blocks.

Approved by: Marko

buf/buf0lru.c

@@ -1273,7 +1273,10 @@ buf_LRU_make_block_young(
 	buf_page_t*	bpage)	/*!< in: control block */
 {
 	ut_ad(buf_pool_mutex_own());
-	buf_pool->stat.n_pages_made_young++;
+
+	if (bpage->old) {
+		buf_pool->stat.n_pages_made_young++;
+	}
 
 	buf_LRU_remove_block(bpage);
 	buf_LRU_add_block_low(bpage, FALSE);