[COMMITTED] ada: Fix inherited postconditions in inlined subprograms

[Marc Poulhiès via Gcc-patches]

From: Bob Duff <d...@adacore.com>

Protect the building of postcondition pragmas in case the
postcondition is not present due to inlining.

gcc/ada/

        * freeze.adb
        (Build_Inherited_Condition_Pragmas): Do nothing if A_Post is
        empty.

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

---
 gcc/ada/freeze.adb | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/gcc/ada/freeze.adb b/gcc/ada/freeze.adb
index 888e2ecb7af..1fdc9d0d60e 100644
--- a/gcc/ada/freeze.adb
+++ b/gcc/ada/freeze.adb
@@ -1718,11 +1718,16 @@ package body Freeze is
                end;
             end if;
 
-            New_Prag := New_Copy_Tree (A_Post);
-            Rewrite
-              (Expression (First (Pragma_Argument_Associations (New_Prag))),
-               Class_Post);
-            Append (New_Prag, Decls);
+            --  A_Post can be null here if the postcondition was inlined in the
+            --  called subprogram.
+
+            if Present (A_Post) then
+               New_Prag := New_Copy_Tree (A_Post);
+               Rewrite
+                 (Expression (First (Pragma_Argument_Associations (New_Prag))),
+                  Class_Post);
+               Append (New_Prag, Decls);
+            end if;
          end if;
       end Build_Inherited_Condition_Pragmas;
 
-- 
2.34.1