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

	* emit-rtl.c (copy_insn_1): Do not copy DEBUG_EXPRs.

Index: gcc/emit-rtl.c
===================================================================
--- gcc/emit-rtl.c.orig	2011-09-15 03:51:41.982777588 -0300
+++ gcc/emit-rtl.c	2011-09-15 03:51:50.767633680 -0300
@@ -5269,6 +5269,7 @@ copy_insn_1 (rtx orig)
   switch (code)
     {
     case REG:
+    case DEBUG_EXPR:
     case CONST_INT:
     case CONST_DOUBLE:
     case CONST_FIXED: