[Ada] Fix position of subprogram body generated for static predicate

2019-07-05  Ed Schonberg  <schonberg@adacore.com>

gcc/ada/

	* sem_ch13.adb (Build_Predicate_Functions): If a subtype that
	carries a static predicate aspect is frozen immediately after
	its declaration, ensure that the generated function body created
	for predicate checking is inserted after the corresponding
	subprogram declaration, which is created at the point the
	declaration is elaborated.

From-SVN: r273122

gcc/ada/ChangeLog

+2019-07-05  Ed Schonberg  <schonberg@adacore.com>
+
+	* sem_ch13.adb (Build_Predicate_Functions): If a subtype that
+	carries a static predicate aspect is frozen immediately after
+	its declaration, ensure that the generated function body created
+	for predicate checking is inserted after the corresponding
+	subprogram declaration, which is created at the point the
+	declaration is elaborated.
+
 2019-07-05  Hristian Kirtchev  <kirtchev@adacore.com>
 
 	* exp_ch7.adb (Cleanup_Record): Use the underlying type when

gcc/ada/sem_ch13.adb

@@ -8902,9 +8902,15 @@ package body Sem_Ch13 is
                         Expression => Expr))));
 
             --  The declaration has been analyzed when created, and placed
-            --  after type declaration. Insert body itself after freeze node.
+            --  after type declaration. Insert body itself after freeze node,
+            --  unless subprogram declaration is already there, in which case
+            --  body better be placed afterwards.
 
-            Insert_After_And_Analyze (N, FBody);
+            if FDecl = Next (N) then
+               Insert_After_And_Analyze (FDecl, FBody);
+            else
+               Insert_After_And_Analyze (N, FBody);
+            end if;
 
             --  The defining identifier of a quantified expression carries the
             --  scope in which the type appears, but when unnesting we need