ifcvt: Allow non-comparisons against 0 in noce_try_cond_zero_arith

Like r16-6332-g2a84a753afcf37 but instead of just allowing any comparisons
against 0, this allows all comparisons. I mentioned this in
https://gcc.gnu.org/pipermail/gcc-patches/2025-December/704463.html.

gcc/ChangeLog:

	* ifcvt.cc (noce_try_cond_zero_arith): Remove restriction on comparison
	against 0.

Signed-off-by: Andrew Pinski <[email protected]>

Author: pinskia

gcc/ifcvt.cc

@@ -3157,9 +3157,6 @@ noce_try_cond_zero_arith (struct noce_if_info *if_info)
   if (!noce_simple_bbs (if_info))
     return false;
 
-  if (!REG_P (XEXP (cond, 0)) || !rtx_equal_p (XEXP (cond, 1), const0_rtx))
-    return false;
-
   a = copy_rtx (if_info->a);
   b = copy_rtx (if_info->b);