[COMMITTED] ada: Fix missing flag for GNATprove

["Marc Poulhiès" <poulhies@adacore.com>]

From: Yannick Moy <moy@adacore.com>

GNATprove expects the frontend to position correctly range check
flags, on expressions which might lead to a range check failure.
This was missing on in-out parameters of calls. Now fixed.

There is no impact on compilation.

gcc/ada/

	* sem_res.adb (Resolve_Actuals): Add range check flag.

Tested on x86_64-pc-linux-gnu, committed on master.

---
 gcc/ada/sem_res.adb | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/gcc/ada/sem_res.adb b/gcc/ada/sem_res.adb
index 67062c6b32b..dc48b0b7638 100644
--- a/gcc/ada/sem_res.adb
+++ b/gcc/ada/sem_res.adb
@@ -4388,6 +4388,17 @@ package body Sem_Res is
                   Resolve (Expression (A));
                end if;
 
+               --  In GNATprove mode, add a range check flag on scalar
+               --  conversions for IN OUT parameters. The check may be
+               --  needed on entry from the call.
+
+               if GNATprove_Mode
+                 and then Ekind (F) = E_In_Out_Parameter
+                 and then Is_Scalar_Type (Etype (F))
+               then
+                  Set_Do_Range_Check (Expression (A));
+               end if;
+
             --  If the actual is a function call that returns a limited
             --  unconstrained object that needs finalization, create a
             --  transient scope for it, so that it can receive the proper
-- 
2.43.2