[Ada] Fix ICE on string concatenation with -gnatd.h

[Eric Botcazou]

This fixes an ICE on a string concatenation with the -gnatd.h switch, which 
causes TREE_PUBLIC to be set on a local temporary 

Tested on x86_64-suse-linux, applied on mainline.


2014-10-27  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/utils.c (create_var_decl_1): For a variable declared
	in the unit, set TREE_PUBLIC only if it has static storage duration.


2014-10-27  Eric Botcazou  <ebotcazou@adacore.com>

	* gnat.dg/specs/concat1.ads: New test.
	* gnat.dg/specs/concat1_pkg.ads: New helper.


-- 
Eric Botcazou
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