2015-03-02  Robert Dewar  <dewar@adacore.com>

	* back_end.adb (Call_Back_End): Remove previous patch,
	the back end now gets to see the result of -gnatd.1
	(Unnest_Subprogram_Mode) processing.
	* elists.ads, elists.adb (List_Length): New function.
	* exp_unst.ads, exp_unst.adb: Major changes, first complete version.
	* sem_util.adb (Check_Nested_Access): Handle formals in
	Unnest_Subprogram_Mode.
	(Adjust_Named_Associations): Minor reformatting.
	* sprint.adb (Sprint_Node_Actual): Fix failure to print aliased
	for parameters.

From-SVN: r221115