[gcc r13-3786] ada: Preanalyze classwide contracts as spec expressions

[Marc Poulhi?s <dkm@gcc.gnu.org>]

https://gcc.gnu.org/g:788e5f06d4e804dcc9e255fa448ba0c3db1586c4

commit r13-3786-g788e5f06d4e804dcc9e255fa448ba0c3db1586c4
Author: Ronan Desplanques <desplanques@adacore.com>
Date:   Mon Oct 17 12:00:09 2022 +0200

    ada: Preanalyze classwide contracts as spec expressions
    
    Classwide contracts are "spec expressions" as defined in the
    documentation in sem.ads. Before this patch, the instances of
    classwide contracts that are destined to class conditions merging
    were not preanalyzed as spec expressions. That caused preanalysis to
    emit spurious errors in some cases.
    
    gcc/ada/
    
            * contracts.adb (Preanalyze_Condition): Use
            Preanalyze_Spec_Expression.

Diff:
---
 gcc/ada/contracts.adb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gcc/ada/contracts.adb b/gcc/ada/contracts.adb
index a300d739eff..21f438f90f3 100644
--- a/gcc/ada/contracts.adb
+++ b/gcc/ada/contracts.adb
@@ -42,13 +42,13 @@ with Nmake;          use Nmake;
 with Opt;            use Opt;
 with Sem;            use Sem;
 with Sem_Aux;        use Sem_Aux;
+with Sem_Ch3;        use Sem_Ch3;
 with Sem_Ch6;        use Sem_Ch6;
 with Sem_Ch8;        use Sem_Ch8;
 with Sem_Ch12;       use Sem_Ch12;
 with Sem_Ch13;       use Sem_Ch13;
 with Sem_Disp;       use Sem_Disp;
 with Sem_Prag;       use Sem_Prag;
-with Sem_Res;        use Sem_Res;
 with Sem_Type;       use Sem_Type;
 with Sem_Util;       use Sem_Util;
 with Sinfo;          use Sinfo;
@@ -4755,7 +4755,7 @@ package body Contracts is
          Install_Formals (Subp);
          Inside_Class_Condition_Preanalysis := True;
 
-         Preanalyze_And_Resolve (Expr, Standard_Boolean);
+         Preanalyze_Spec_Expression (Expr, Standard_Boolean);
 
          Inside_Class_Condition_Preanalysis := False;
          Remove_Formals (Subp);