[RS6000] rs6000_rtx_costs for PLUS/MINUS constant

[Alan Modra via Gcc-patches]

These functions do behave a little differently for SImode, so the
mode should be passed.

        * config/rs6000/rs6000.c (rs6000_rtx_costs): Pass mode to
        reg_or_add_cint_operand and reg_or_sub_cint_operand.

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 6fc86f8185a..32044d33977 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -21189,9 +21189,9 @@ rs6000_rtx_costs (rtx x, machine_mode mode, int 
outer_code,
          return true;
        }
       else if ((outer_code == PLUS
-               && reg_or_add_cint_operand (x, VOIDmode))
+               && reg_or_add_cint_operand (x, mode))
               || (outer_code == MINUS
-                  && reg_or_sub_cint_operand (x, VOIDmode))
+                  && reg_or_sub_cint_operand (x, mode))
               || ((outer_code == SET
                    || outer_code == IOR
                    || outer_code == XOR)