[COMMITTED 20/40] ada: Fix libgpr2 build failure with compiler built with assertions

[Marc Poulhiès]

From: Eric Botcazou <ebotca...@adacore.com>

The problem is that the Entity field is accessed for a node without one.

gcc/ada/ChangeLog:

        * sem_ch10.adb (Install_Siblings.In_Context): Add missing guard.

Tested on x86_64-pc-linux-gnu, committed on master.

---
 gcc/ada/sem_ch10.adb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gcc/ada/sem_ch10.adb b/gcc/ada/sem_ch10.adb
index 9af96fc41b6..25bba9b6075 100644
--- a/gcc/ada/sem_ch10.adb
+++ b/gcc/ada/sem_ch10.adb
@@ -4924,6 +4924,8 @@ package body Sem_Ch10 is
                            if Entity (Name (Clause)) = Id
                              or else
                                (Nkind (Name (Clause)) = N_Expanded_Name
+                                 and then
+                                   Is_Entity_Name (Prefix (Name (Clause)))
                                  and then Entity (Prefix (Name (Clause))) = Id)
                            then
                               return True;
-- 
2.43.0