[Ada] Small tweak to help GDB to display aliased dynamic array

[Eric Botcazou]

This isn't a regression, but the patch doesn't change the generated code, just 
creates a VAR_DECL for debugging purposes.

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


2012-01-27  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (gnat_to_gnu_entity) <object>: For an aliased
	object with an unconstrained nominal subtype and if optimization isn't
	enabled, create a special VAR_DECL for debugging purposes.


-- 
Eric Botcazou
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