micro-opt: add an UNLIKELY


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15235 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/helgrind/libhb_core.c b/helgrind/libhb_core.c
index 3fd59ef..791e95e 100644
--- a/helgrind/libhb_core.c
+++ b/helgrind/libhb_core.c
@@ -1647,7 +1647,7 @@
       if (address_in_range(cache_shmem.tags0[ga_ix], ga, szB))
          cache_shmem.tags0[ga_ix] = 1/*INVALID*/;
       ga_ix++;
-      if (ga_ix == N_WAY_NENT)
+      if (UNLIKELY(ga_ix == N_WAY_NENT))
          ga_ix = 0;
    }
 }