[gcc r13-1489] [Ada] Fix spurious error on object renaming with ghost type

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

https://gcc.gnu.org/g:95e2844ef8fa68f7abd45646bae8b4362614bf9c

commit r13-1489-g95e2844ef8fa68f7abd45646bae8b4362614bf9c
Author: Yannick Moy <moy@adacore.com>
Date:   Tue Jun 7 11:00:56 2022 +0200

    [Ada] Fix spurious error on object renaming with ghost type
    
    Renaming of an object of ghost type leads to a spurious error.  Now
    fixed.
    
    gcc/ada/
    
            * ghost.adb (Is_OK_Ghost_Context): Detect ghost type inside object
            renaming.

Diff:
---
 gcc/ada/ghost.adb | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/gcc/ada/ghost.adb b/gcc/ada/ghost.adb
index 25b9a28fa01..8f23cbdedfe 100644
--- a/gcc/ada/ghost.adb
+++ b/gcc/ada/ghost.adb
@@ -508,7 +508,16 @@ package body Ghost is
                elsif Nkind (Parent (Par)) in N_Generic_Instantiation
                                            | N_Renaming_Declaration
                                            | N_Generic_Renaming_Declaration
-                   and then Par = Name (Parent (Par))
+                 and then Par = Name (Parent (Par))
+               then
+                  return True;
+
+               --  In the case of the renaming of a ghost object, the type
+               --  itself may be ghost.
+
+               elsif Nkind (Parent (Par)) = N_Object_Renaming_Declaration
+                 and then (Par = Subtype_Mark (Parent (Par))
+                             or else Par = Access_Definition (Parent (Par)))
                then
                   return True;