[Ada] Implement switches to reorder record components in gigi

[Eric Botcazou]

This is the gigi part of the implementation of the -gnatd.r/-gnatd.v switches 
that allow record components to be reordered in certain cases.  The algorithm 
is documented in the code.

Tested on i586-suse-linux, applied on the mainline.


2011-03-21  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (components_to_record): Add REORDER parameter,
	rename DEBUG_INFO_P into DEBUG_INFO and move P_GNU_REP_LIST parameter
	to the end of the list.  Adjust recursive call.  Rename local variable.
	If REORDER is true, reorder components of the record type.
	(gnat_to_gnu_entity): Pass OK_To_Reorder_Components flag as argument to
	components_to_record and adjust the parameter list.


-- 
Eric Botcazou
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