[Ada] More complete information level for -gnatR4 output

[Ada] More complete information level for -gnatR4 output

This instructs -gnatR4 to also list the Etype of components in
user-declared record types if it is compiler-generated, for example in:

package P3 is

    type idx is range 1 .. 100;

    type Arr is array (Idx range <>) of Character;

    type Rec is record
       C : Arr (1 .. 5);
    end record;

end P3;

2019-08-21  Eric Botcazou  <ebotcazou@adacore.com>

gcc/ada/

	* repinfo.adb (List_Array_Info): In -gnatR4 mode, set the
	relevant flag on the component type here instead of...
	(List_Object_Info): Likewise for the object type.
	(List_Entities): ...here.  In -gnatR4 mode, recurse into
	entities local to a record type.
	(List_Component_Layout): In -gnatR4 mode, mark the type as
	relevant.

From-SVN: r274786