Add regression test

gcc/testsuite/
	PR ada/116190
	* gnat.dg/aggr31.adb: New test.

Author: Eric Botcazou

gcc/testsuite/gnat.dg/aggr31.adb

@@ -0,0 +1,17 @@
+-- { dg-do run }
+-- { dg-options "-gnat2022" }
+
+with Ada.Strings.Unbounded; use Ada.Strings.Unbounded;
+
+procedure Aggr31 is
+
+  My_Array : constant array (1 .. 5) of Unbounded_String :=
+    [others => To_Unbounded_String ("Test")];
+
+  This_Crashes : constant array (Natural range <>) of Unbounded_String :=
+    [for I of My_Array => I];
+
+begin
+  null;
+end;
+