[gcc r15-423] ada: Remove code that expected pre/post being split into conjuncts

[gcc r15-423] ada: Remove code that expected pre/post being split into conjuncts

[Marc Poulhi?s]

https://gcc.gnu.org/g:51b84f23b551d12e237290d3fe6311ffbe7bdc0c

commit r15-423-g51b84f23b551d12e237290d3fe6311ffbe7bdc0c
Author: Piotr Trojanek <trojanek@adacore.com>
Date:   Mon Feb 5 13:18:50 2024 +0100

    ada: Remove code that expected pre/post being split into conjuncts
    
    The removed code is no longer needed (and causes assertion failures).
    Most likely it should have been using the Split_PPC flag.
    
    gcc/ada/
    
            * sem_util.adb (Is_Potentially_Unevaluated): Remove code for
            recovering the original structure of expressions with AND THEN.

Diff:
---
 gcc/ada/sem_util.adb | 29 ++---------------------------
 1 file changed, 2 insertions(+), 27 deletions(-)

diff --git a/gcc/ada/sem_util.adb b/gcc/ada/sem_util.adb
index 1166c68b9727..b5c33638b35f 100644
--- a/gcc/ada/sem_util.adb
+++ b/gcc/ada/sem_util.adb
@@ -19582,39 +19582,14 @@ package body Sem_Util is
 
       --  Local variables
 
-      Par  : Node_Id;
       Expr : Node_Id;
+      Par  : Node_Id;
 
    --  Start of processing for Is_Potentially_Unevaluated
 
    begin
       Expr := N;
-      Par  := N;
-
-      --  A postcondition whose expression is a short-circuit is broken down
-      --  into individual aspects for better exception reporting. The original
-      --  short-circuit expression is rewritten as the second operand, and an
-      --  occurrence of 'Old in that operand is potentially unevaluated.
-      --  See sem_ch13.adb for details of this transformation. The reference
-      --  to 'Old may appear within an expression, so we must look for the
-      --  enclosing pragma argument in the tree that contains the reference.
-
-      while Present (Par)
-        and then Nkind (Par) /= N_Pragma_Argument_Association
-      loop
-         if Is_Rewrite_Substitution (Par)
-           and then Nkind (Original_Node (Par)) = N_And_Then
-         then
-            return True;
-         end if;
-
-         Par := Parent (Par);
-      end loop;
-
-      --  Other cases; 'Old appears within other expression (not the top-level
-      --  conjunct in a postcondition) with a potentially unevaluated operand.
-
-      Par := Parent (Expr);
+      Par  := Parent (Expr);
 
       while Present (Par)
         and then Nkind (Par) /= N_Pragma_Argument_Association