[Ada] Move messages on division by zero to the right operand

[Pierre-Marie de Rodat via Gcc-patches]

All compile-time messages about division by zero are now located at the
right operand. Previously some of them were located at the division
operator, which was inconsistent.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

        * sem_eval.adb (Eval_Arithmetic_Op): Add Loc parameter to all
        calls to Apply_Compile_Time_Constraint_Error related to division
        by zero.
diff --git a/gcc/ada/sem_eval.adb b/gcc/ada/sem_eval.adb
--- a/gcc/ada/sem_eval.adb
+++ b/gcc/ada/sem_eval.adb
@@ -2117,6 +2117,7 @@ package body Sem_Eval is
 
                      Apply_Compile_Time_Constraint_Error
                        (N, "division by zero", CE_Divide_By_Zero,
+                        Loc  => Sloc (Right),
                         Warn => not Stat or SPARK_Mode = On);
                      return;
 
@@ -2139,6 +2140,7 @@ package body Sem_Eval is
 
                      Apply_Compile_Time_Constraint_Error
                        (N, "mod with zero divisor", CE_Divide_By_Zero,
+                        Loc  => Sloc (Right),
                         Warn => not Stat or SPARK_Mode = On);
                      return;
 
@@ -2159,6 +2161,7 @@ package body Sem_Eval is
 
                      Apply_Compile_Time_Constraint_Error
                        (N, "rem with zero divisor", CE_Divide_By_Zero,
+                        Loc  => Sloc (Right),
                         Warn => not Stat or SPARK_Mode = On);
                      return;
 
@@ -2218,7 +2221,8 @@ package body Sem_Eval is
             else pragma Assert (Nkind (N) = N_Op_Divide);
                if UR_Is_Zero (Right_Real) then
                   Apply_Compile_Time_Constraint_Error
-                    (N, "division by zero", CE_Divide_By_Zero);
+                    (N, "division by zero", CE_Divide_By_Zero,
+                     Loc => Sloc (Right));
                   return;
                end if;