[Ada] Plug small hole in -gnatR output

The -gnatR switch outputs representation information for locally-defined
types but it was skipping those defined in blocks without label, unlike
those defined in named blocks.  This change plugs this small hole.

The following procedure:

procedure P is
begin
  declare
    type R is record
      I : Integer;
    end record;
  begin
    null;
  end;
end;

must now generate the following output with -gnatR:

Representation information for unit P (body)
--------------------------------------------

for B_1.R'Size use 32;
for B_1.R'Alignment use 4;
for B_1.R use record
   I at 0 range  0 .. 31;
end record;

2018-05-29  Eric Botcazou  <ebotcazou@adacore.com>

gcc/ada/

	* repinfo.adb (List_Entities): Also recurse into blocks without label.

From-SVN: r260884

gcc/ada/ChangeLog

+2018-05-29  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* repinfo.adb (List_Entities): Also recurse into blocks without label.
+
 2018-05-29  Ed Schonberg  <schonberg@adacore.com>
 
 	* exp_ch6.adb (Expand_N_Subprogram_Body): Do not generate push/pop for

gcc/ada/repinfo.adb

@@ -408,7 +408,12 @@ package body Repinfo is
             --  info for the full view). If debug flag A is set, then all
             --  entities are listed
 
-            if (Comes_From_Source (E)
+            if ((Comes_From_Source (E)
+                   or else (Ekind (E) = E_Block
+                              and then
+                            Nkind (Parent (E)) = N_Implicit_Label_Declaration
+                              and then
+                            Comes_From_Source (Label_Construct (Parent (E)))))
               and then not Is_Incomplete_Or_Private_Type (E)
               and then not (Ekind (E) = E_Constant
                               and then Present (Full_View (E))))