[Ada] Place exported constants in read-only memory

[Eric Botcazou]

We interpret 13.3(19) conservatively and basically disallow any optimizations 
for an object covered by it.  But that's overkill for constants and prevents 
them from being placed in read-only memory.

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


2009-04-21  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (gnat_to_gnu_entity) <object>: Do not make
	constant objects covered by 13.3(19) volatile.


-- 
Eric Botcazou
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