decl.c (gnat_to_gnu_entity): Don't generate debug info for inner record types if -fgnat-encodings=minimal.

	* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Record_Type>: Don't
	generate debug info for inner record types if -fgnat-encodings=minimal.
	(gnat_to_gnu_entity) <E_Record_Subtype>: Use the ultimate base record
	type as the debug type.

From-SVN: r251937