decl.c (gnat_to_gnu_entity): Use a reference to the original type for the type of...

decl.c (gnat_to_gnu_entity): Use a reference to the original type for the type of the field of the XVS type.

	* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Record_Subtype>: Use
	a reference to the original type for the type of the field of the
	XVS type.
	(maybe_pad_type): Likewise.

	* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Record_Type>: Factor
	common predicate and remove redundant setting of TYPE_BY_REFERENCE_P.
	Pass correctly typed arguments to create_field_decl.
	<E_Record_Subtype>: Set BLKmode for tagged and limited types in the
	case of contrained discriminants as well.  Use the padded base type
	in the other case as well.  Rename temporary variable.  Tweak test.
	Factor common access pattern.  Set GNU_SIZE only once.

From-SVN: r148345