[gcc r13-585] [Ada] Small performance tweak in recent change

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

https://gcc.gnu.org/g:700cd7d6733e62e5ad8212cb6c51866679173b41

commit r13-585-g700cd7d6733e62e5ad8212cb6c51866679173b41
Author: Eric Botcazou <ebotcazou@adacore.com>
Date:   Wed Mar 30 12:59:23 2022 +0200

    [Ada] Small performance tweak in recent change
    
    This avoids a useless walk of the prefix chain in instances.
    
    gcc/ada/
    
            * sem_ch8.adb (Analyze_Subprogram_Renaming): Move final test on
            In_Instance to outer condition.

Diff:
---
 gcc/ada/sem_ch8.adb | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/gcc/ada/sem_ch8.adb b/gcc/ada/sem_ch8.adb
index 1cf34117a30..5945bfdf90d 100644
--- a/gcc/ada/sem_ch8.adb
+++ b/gcc/ada/sem_ch8.adb
@@ -3975,7 +3975,7 @@ package body Sem_Ch8 is
          --  normally illegal renamings can be constructed when expanding
          --  instantiations.
 
-         elsif Nkind (Nam) = N_Expanded_Name then
+         elsif Nkind (Nam) = N_Expanded_Name and then not In_Instance then
             declare
                function Ult_Expanded_Prefix (N : Node_Id) return Node_Id is
                  (if Nkind (N) /= N_Expanded_Name
@@ -3985,7 +3985,6 @@ package body Sem_Ch8 is
 
             begin
                if Chars (Entity (Ult_Expanded_Prefix (Nam))) = Chars (New_S)
-                 and then not In_Instance
                then
                   Error_Msg_Sloc := Sloc (N);
                   Error_Msg_NE