[Ada] Minor tweak to output of -gnatR

This changes the output of -gnatR for extensions of tagged record types to
avoid displaying the internal _Parent component, which overlaps with other
components and is thus more confusing than helpful.

For the following hierarchy:

  type R1 is tagged record
    I : Integer;
  end record;

  type R2 is new R1 with record
    C : Character;
  end record;

the output -gnatR must now be:

for R1'Object_Size use 128;
for R1'Value_Size use 96;
for R1'Alignment use 8;
for R1 use record
   _Tag at 0 range  0 .. 63;
   I    at 8 range  0 .. 31;
end record;

for R2'Object_Size use 192;
for R2'Value_Size use 136;
for R2'Alignment use 8;
for R2 use record
   _Tag at  0 range  0 .. 63;
   I    at  8 range  0 .. 31;
   C    at 16 range  0 ..  7;
end record;

2018-05-28  Eric Botcazou  <ebotcazou@adacore.com>

gcc/ada/

	* repinfo.adb (Compute_Max_Length): Skip _Parent component.
	(List_Record_Layout): Likewise.

From-SVN: r260819

gcc/ada/ChangeLog

+2018-05-28  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* repinfo.adb (Compute_Max_Length): Skip _Parent component.
+	(List_Record_Layout): Likewise.
+
 2018-05-28  Ed Schonberg  <schonberg@adacore.com>
 
 	* sem_util.adb (Is_Function_Result): Add a warning if a postcondition

gcc/ada/repinfo.adb

@@ -915,6 +915,12 @@ package body Repinfo is
                goto Continue;
             end if;
 
+            --  Skip _Parent component in extension (to avoid overlap)
+
+            if Chars (Comp) = Name_uParent then
+               goto Continue;
+            end if;
+
             --  All other cases
 
             declare
@@ -1010,6 +1016,12 @@ package body Repinfo is
                goto Continue;
             end if;
 
+            --  Skip _Parent component in extension (to avoid overlap)
+
+            if Chars (Comp) = Name_uParent then
+               goto Continue;
+            end if;
+
             --  All other cases
 
             declare