branches/zip: Add UNIV_UNLIKELY hints to help branch prediction.

include/ut0lst.h

@@ -73,12 +73,12 @@ the pointer to the node to be added to the list. NAME is the list name. */
 	((BASE).count)++;\
 	((N)->NAME).next = (BASE).start;\
 	((N)->NAME).prev = NULL;\
-	if ((BASE).start != NULL) {\
+	if (UNIV_LIKELY((BASE).start != NULL)) {\
 		ut_ad((BASE).start != (N));\
 		(((BASE).start)->NAME).prev = (N);\
 	}\
 	(BASE).start = (N);\
-	if ((BASE).end == NULL) {\
+	if (UNIV_UNLIKELY((BASE).end == NULL)) {\
 		(BASE).end = (N);\
 	}\
 }\

rem/rem0rec.c

@@ -533,7 +533,7 @@ rec_get_offsets_func(
 
 	if (UNIV_UNLIKELY(!offsets)
 	    || UNIV_UNLIKELY(rec_offs_get_n_alloc(offsets) < size)) {
-		if (!*heap) {
+		if (UNIV_UNLIKELY(!*heap)) {
 			*heap = mem_heap_create_func(size * sizeof(ulint),
 						     MEM_HEAP_DYNAMIC,
 						     file, line);