[Ada] Do not overly promote alignment of local variable

[Eric Botcazou]

This limits the alignment promotion we do for local aggregate variables in Ada, 
which doesn't play nice with the NRV optimization.

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


2011-09-25  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (gnat_to_gnu_entity) <object>: Do not promote
	the alignment if this doesn't prevent BLKmode access to the object.


2011-09-25  Eric Botcazou  <ebotcazou@adacore.com>

	* gnat.dg/frame_overflow.ads: New.
	* gnat.dg/frame_overflow.adb: Adjust.
	* gnat.dg/specs/addr1.ads: Likewise.


-- 
Eric Botcazou
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