[gcc r13-190] [Ada] Set Error_Msg_Warn before use of << insertion

[Pierre-Marie de Rodat <pmderodat@gcc.gnu.org>]

https://gcc.gnu.org/g:706940c2c867bc2609338f27eaea056aedc13d63

commit r13-190-g706940c2c867bc2609338f27eaea056aedc13d63
Author: Yannick Moy <moy@adacore.com>
Date:   Thu Jan 13 17:35:24 2022 +0100

    [Ada] Set Error_Msg_Warn before use of << insertion
    
    Calls to Error_Msg procedures with a message using the < or <<
    insertions need to set appropriately Error_Msg_Warn. This was not done
    in one call, which would lead to spurious errors when changing the
    implementation of a runtime unit. This fixes it so that changes can be
    applied.
    
    gcc/ada/
    
            * exp_ch4.adb (Expand_Allocator_Expression): Set Error_Msg_Warn
            correctly.

Diff:
---
 gcc/ada/exp_ch4.adb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/ada/exp_ch4.adb b/gcc/ada/exp_ch4.adb
index 09e734defb2..9de384a4eb9 100644
--- a/gcc/ada/exp_ch4.adb
+++ b/gcc/ada/exp_ch4.adb
@@ -835,6 +835,7 @@ package body Exp_Ch4 is
               Make_Raise_Program_Error (Loc,
                 Reason => PE_Accessibility_Check_Failed));
 
+            Error_Msg_Warn := SPARK_Mode /= On;
             Error_Msg_N ("anonymous access discriminant is too deep for use"
                          & " in allocator<<", N);
             Error_Msg_N ("\Program_Error [<<", N);