[Ada] Fix bogus CE raised on call to overloaded function

[Eric Botcazou]

The attached code (derived from ACATS c34006d) raises a bogus Constraint_Error 
since at least GCC 3.4:

raised CONSTRAINT_ERROR : p.adb:33 discriminant check failed

This is related to the overloading of function Create.

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


2011-03-24  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/trans.c (gnat_to_gnu): Remove obsolete case of
	non-conversion to the nominal result type at the end.


2011-03-24  Eric Botcazou  <ebotcazou@adacore.com>

	* gnat.dg/derived_type2.adb: New test.


-- 
Eric Botcazou
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