[Ada] Fix bogus error with packed array type on AVR

[Eric Botcazou]

The testcase fails to compile for targets that define MAX_FIXED_MODE_SIZE to 
something smaller than 64, in particular the AVR.  It turns out that the 
check responsible for the problem is overzealous and can be relaxed.

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


2009-10-30  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/utils.c (MAX_FIXED_MODE_SIZE): Delete.
	(create_field_decl): Update description.  In a packed record, round
	the size up to a byte boundary only if the field's type has BLKmode.
	* gcc-interface/gigi.h (create_field_decl): Update description.


2009-10-30  Eric Botcazou  <ebotcazou@adacore.com>

	* gnat.dg/specs/pack5.ads: New test.


-- 
Eric Botcazou
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