Add testcase for PR ada/114708

gcc/testsuite/
	PR ada/114708
	* gnat.dg/incomplete8.adb: New test.

gcc/testsuite/gnat.dg/incomplete8.adb

@@ -0,0 +1,22 @@
+-- PR ada/114708
+-- Reported by Jere <jhb.chat@gmail.com>
+
+-- { dg-do compile }
+
+procedure Incomplete8 is
+
+  generic
+    type Element_Type(<>);
+  package Test_Incomplete_Formal is
+    type Element_Access is access Element_Type;
+  end Test_Incomplete_Formal;
+
+  type Node;
+
+  package P is new Test_Incomplete_Formal(Node);
+
+  type Node is limited null record;
+   
+begin
+  null;
+end;