for  gcc/ChangeLog
from  Alexandre Oliva  <aoliva@redhat.com>

	* cprop.c (local_cprop_pass): Don't set changed for debug insns.

Index: gcc/cprop.c
===================================================================
--- gcc/cprop.c.orig	2011-06-04 05:09:24.414816329 -0300
+++ gcc/cprop.c	2011-06-04 05:09:25.954797626 -0300
@@ -1223,7 +1223,8 @@ local_cprop_pass (void)
 		    {
 		      if (do_local_cprop (reg_use_table[i], insn))
 			{
-			  changed = true;
+			  if (!DEBUG_INSN_P (insn))
+			    changed = true;
 			  break;
 			}
 		    }