[Ada] Fix internal error on limited_with clause in ASIS mode

[Eric Botcazou]

This fixes an ICE in ASIS mode (-gnatct switch) on a chain of with clauses 
with a terminal limited_with clause of the first member.

Tested on x86_64-suse-linux, applied on the mainline.


2015-05-27  Eric Botcazou  <ebotca...@adacore.com>

        * gcc-interface/trans.c (elaborate_all_entities): Do not elaborate an
        incomplete type coming from a limited_with and whose non-limited view
        comes from the main unit.


-- 
Eric Botcazou
Index: gcc-interface/trans.c
===================================================================
--- gcc-interface/trans.c	(revision 223768)
+++ gcc-interface/trans.c	(working copy)
@@ -8158,6 +8158,10 @@ elaborate_all_entities (Node_Id gnat_nod
 		  && Ekind (gnat_entity) != E_Operator
 		  && !(IN (Ekind (gnat_entity), Type_Kind)
 		       && !Is_Frozen (gnat_entity))
+		  && !(IN (Ekind (gnat_entity), Incomplete_Kind)
+		       && From_Limited_With (gnat_entity)
+		       && In_Extended_Main_Code_Unit
+			  (Non_Limited_View (gnat_entity)))
 		  && !((Ekind (gnat_entity) == E_Procedure
 			|| Ekind (gnat_entity) == E_Function)
 		       && Is_Intrinsic_Subprogram (gnat_entity))