DRD, refactoring: Introduce DRD_(trace_msg)()

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@12120 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/drd/drd_hb.c b/drd/drd_hb.c
index 3a3f470..919d171 100644
--- a/drd/drd_hb.c
+++ b/drd/drd_hb.c
@@ -165,12 +165,8 @@
 
    p = DRD_(hb_get_or_allocate)(hb);
    if (DRD_(s_trace_hb))
-   {
-      VG_(message)(Vg_UserMsg,
-                   "[%d] happens_before 0x%lx\n",
-                   DRD_(thread_get_running_tid)(),
-                   hb);
-   }
+      DRD_(trace_msg)("[%d] happens_before 0x%lx\n",
+                      DRD_(thread_get_running_tid)(), hb);
 
    if (!p)
       return;
@@ -203,10 +199,8 @@
    p = DRD_(hb_get_or_allocate)(hb);
 
    if (DRD_(s_trace_hb))
-   {
-      VG_(message)(Vg_UserMsg, "[%d] happens_after  0x%lx\n",
-                   DRD_(thread_get_running_tid)(), hb);
-   }
+      DRD_(trace_msg)("[%d] happens_after  0x%lx\n",
+                      DRD_(thread_get_running_tid)(), hb);
 
    if (!p)
       return;
@@ -237,10 +231,8 @@
    struct hb_info* p;
 
    if (DRD_(s_trace_hb))
-   {
-      VG_(message)(Vg_UserMsg, "[%d] happens_done  0x%lx\n",
-                   DRD_(thread_get_running_tid)(), hb);
-   }
+      DRD_(trace_msg)("[%d] happens_done  0x%lx\n",
+                      DRD_(thread_get_running_tid)(), hb);
 
    p = DRD_(hb_get)(hb);
    if (!p)