[Ada] In a generic use Presanalyze_Spec_Expression on Predicates

When verifying that the meaning of an aspect has not changed between the
freeze point of the entity and the end of the declarations, we analkyze
a copy of the expression to verify its conformance to previous analysis.
If the expression contains overloaded references, these have to be
resolved, which is not done if the expression is only preanalyzed.  This
applies in particular to expressions in predicates.

2019-09-17  Ed Schonberg  <schonberg@adacore.com>

gcc/ada/

	* sem_ch13.adb (Check_Aspect_At_End_Of_Declarations): In a
	generic context, for a Predicate aspect, use
	Preanalyze_Spec_Expression to verify conformance.

gcc/testsuite/

	* gnat.dg/predicate13.adb, gnat.dg/predicate13.ads: New
	testcase.

From-SVN: r275778

gcc/ada/ChangeLog

+2019-09-17  Ed Schonberg  <schonberg@adacore.com>
+
+	* sem_ch13.adb (Check_Aspect_At_End_Of_Declarations): In a
+	generic context, for a Predicate aspect, use
+	Preanalyze_Spec_Expression to verify conformance.
+
 2019-09-17  Javier Miranda  <miranda@adacore.com>
 
 	* sem_ch3.adb (Constrain_Corresponding_Record): Propagate

gcc/ada/sem_ch13.adb

@@ -9383,7 +9383,7 @@ package body Sem_Ch13 is
               or else A_Id = Aspect_Priority
             then
                Push_Type (Ent);
-               Preanalyze (Freeze_Expr);
+               Preanalyze_Spec_Expression (Freeze_Expr, T);
                Pop_Type (Ent);
             else
                Preanalyze (Freeze_Expr);

gcc/testsuite/ChangeLog

+2019-09-17  Ed Schonberg  <schonberg@adacore.com>
+
+	* gnat.dg/predicate13.adb, gnat.dg/predicate13.ads: New
+	testcase.
+
 2019-09-17  Javier Miranda  <miranda@adacore.com>
 
 	* gnat.dg/limited4.adb: New testcase.

gcc/testsuite/gnat.dg/predicate13.adb

+package body Predicate13 is
+    procedure Dummy is null;
+end Predicate13;
\ No newline at end of file

gcc/testsuite/gnat.dg/predicate13.ads

+--  { dg-do compile }
+generic
+package Predicate13 is
+
+    function Valid return Boolean is
+    (True);
+
+    function Foo return Boolean is
+    (True);
+
+    type State_Type is (Valid, Invalid);
+    type Context_Type is private;
+
+    private
+
+    type Context_Type is
+    record
+    State : State_Type;
+    end record  with Dynamic_Predicate => (State = Valid);
+
+    procedure Dummy;
+
+end Predicate13;