trans.c (Subprogram_Body_to_gnu): For a function with copy-in/copy-out parameters and which returns by invisible...

	* gcc-interface/trans.c (Subprogram_Body_to_gnu): For a function with
	copy-in/copy-out parameters and which returns by invisible reference,
	do not create the variable for the return value; instead, manually
	generate the indirect copy out statements on exit.
	(gnat_to_gnu) <N_Simple_Return_Statement>: Adjust accordingly and build
	a simple indirect assignment for the return value.

From-SVN: r217155