[gcc r13-3794] ada: Propagate aspect Ghost when instantiating null formal procedures

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

https://gcc.gnu.org/g:a645dc3c20c32ede1b5f50f1a35705ce87a3d61b

commit r13-3794-ga645dc3c20c32ede1b5f50f1a35705ce87a3d61b
Author: Piotr Trojanek <trojanek@adacore.com>
Date:   Fri Oct 21 20:12:15 2022 +0200

    ada: Propagate aspect Ghost when instantiating null formal procedures
    
    When instantiating generic package that includes a formal subprogram
    declaration with Ghost aspect and a subprogram_default of null, e.g.:
    
       generic
         with procedure Proc is null with Ghost;
       package P is ...
    
    the Ghost aspect should be propagated to the internally generated null
    subprogram, so this null subprogram can be used in contexts that require
    ghost entities.
    
    gcc/ada/
    
            * sem_ch12.adb (Instantiate_Formal_Subprogram): Copy aspect Ghost
            from formal subprogram declaration to the internally generated
            procedure.

Diff:
---
 gcc/ada/sem_ch12.adb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/ada/sem_ch12.adb b/gcc/ada/sem_ch12.adb
index ca0f4913e36..276656085be 100644
--- a/gcc/ada/sem_ch12.adb
+++ b/gcc/ada/sem_ch12.adb
@@ -11088,6 +11088,8 @@ package body Sem_Ch12 is
 
          Set_Convention (Defining_Unit_Name (New_Spec), Convention_Intrinsic);
 
+         Copy_Ghost_Aspect (Formal, To => Decl_Node);
+
          --  Eliminate the calls to it when optimization is enabled
 
          Set_Is_Inlined (Defining_Unit_Name (New_Spec));