exp_pakd.adb (Create_Packed_Array_Type): Always use a modular type if the size is small enough.

	* exp_pakd.adb (Create_Packed_Array_Type): Always use a modular type
	if the size is small enough.  Propagate the alignment if there is an
	alignment clause on the original array type.
	* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Modular_Integer_Subtype>
	Deal with under-aligned packed array types.  Copy the size onto the
	justified modular type and don't lay it out again.  Likewise for the
	padding type built for other under-aligned subtypes.
	* gcc-interface/utils.c (finish_record_type): Do not set a default mode
	on the type.

From-SVN: r158056