re PR rtl-optimization/42775 (GCC fails to rebuild itself with STAGE1_CFLAGS=-O1)

	PR rtl-optimization/42775
	* cfgrtl.c (rest_of_pass_free_cfg): Recompute notes if delay slot
	scheduling is enabled.

From-SVN: r164458

gcc/ChangeLog

+2010-09-20  Eric Botcazou  <ebotcazou@adacore.com>
+
+	PR rtl-optimization/42775
+	* cfgrtl.c (rest_of_pass_free_cfg): Recompute notes if delay slot
+	scheduling is enabled.
+
 2010-09-20  Jakub Jelinek  <jakub@redhat.com>
 
 	PR rtl-optimization/45728

gcc/cfgrtl.c

@@ -421,7 +421,10 @@ rest_of_pass_free_cfg (void)
   /* The resource.c machinery uses DF but the CFG isn't guaranteed to be
      valid at that point so it would be too late to call df_analyze.  */
   if (optimize > 0 && flag_delayed_branch)
-    df_analyze ();
+    {
+      df_note_add_problem ();
+      df_analyze ();
+    }
 #endif
 
   free_bb_for_insn ();