[Ada] Add support for scalar types with small alignment

[Eric Botcazou]

It is piggybacked on the padding machinery.  This makes it possible to write

  type My_Integer is new Integer;
  for My_Integer'Alignment use 1;

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


2008-03-08  Eric Botcazou  <ebotcazou@adacore.com>

	* decl.c (gnat_to_gnu_entity) <E_Signed_Integer_Subtype>: Add suppor
	for scalar types with small alignment.


2008-03-08  Eric Botcazou  <ebotcazou@adacore.com>

        * gnat.dg/small_alignment.adb: New test.


-- 
Eric Botcazou
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