[Ada] Fix overzealous renaming optimization

[Eric Botcazou]

This was exposed very recently because of some front-end changes.  And the 
comment already says what to do.

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


2009-01-12  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (gnat_to_gnu_entity) <object>: Really strip
	only useless conversions around renamed objects.


2009-01-12  Eric Botcazou  <ebotcazou@adacore.com>

	* gnat.dg/unchecked_convert3.adb: New test.


-- 
Eric Botcazou
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