loop.c (init_loop): Use pseudo reg in add_cost computation so cost doesn't vary depending on...

	* loop.c (init_loop): Use pseudo reg in add_cost computation
	so cost doesn't vary depending on whether reg 0 happens to be
	fixed or not.

From-SVN: r11458

gcc/loop.c

@@ -302,7 +302,7 @@ void
 init_loop ()
 {
   char *free_point = (char *) oballoc (1);
-  rtx reg = gen_rtx (REG, word_mode, 0);
+  rtx reg = gen_rtx (REG, word_mode, LAST_VIRTUAL_REGISTER + 1);
 
   add_cost = rtx_cost (gen_rtx (PLUS, word_mode, reg, reg), SET);