Don't search DEBUG_INSNs for removable zero extends.

2010-06-25  H.J. Lu  <hongjiu.lu@intel.com>

	PR rtl-optimization/44326
	* implicit-zee.c (find_removable_zero_extends): Replace
	INSN_P with NONDEBUG_INSN_P.

From-SVN: r161389

gcc/ChangeLog

+2010-06-25  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR rtl-optimization/44326
+	* implicit-zee.c (find_removable_zero_extends): Replace
+	INSN_P with NONDEBUG_INSN_P.
+
 2010-06-25  Martin Jambor  <mjambor@suse.cz>
 
 	* ipa-prop.h (struct ipa_param_descriptor): Removed the modified flag.

gcc/implicit-zee.c

@@ -858,7 +858,7 @@ find_removable_zero_extends (void)
     {
       FOR_BB_INSNS (curr_block, curr_insn)
         {
-          if (!INSN_P (curr_insn))
+          if (!NONDEBUG_INSN_P (curr_insn))
             continue;
 
           type = for_each_rtx (&PATTERN (curr_insn),