Added more statistics.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@9727 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/drd/drd_segment.c b/drd/drd_segment.c
index d513efa..32c5e28 100644
--- a/drd/drd_segment.c
+++ b/drd/drd_segment.c
@@ -38,6 +38,7 @@
 
 /* Local variables. */
 
+static ULong s_segment_merge_count;
 static ULong s_segments_created_count;
 static ULong s_segments_alive_count;
 static ULong s_max_segments_alive_count;
@@ -215,6 +216,8 @@
       VG_(message)(Vg_UserMsg, "%s", msg);
    }
 
+   s_segment_merge_count++;
+
    // Keep sg1->stacktrace.
    // Keep sg1->vc.
    // Merge sg2->bm into sg1->bm.
@@ -258,3 +261,8 @@
 {
    return s_max_segments_alive_count;
 }
+
+ULong DRD_(sg_get_segment_merge_count)(void)
+{
+   return s_segment_merge_count;
+}