2019-12-12  Dmitriy Anisimkov  <anisimko@adacore.com>

gcc/ada/

	* libgnat/g-comlin.ads (Get_Argument): New routine similar to
	original Get_Argument but with one more out parameter
	End_Of_Arguments.
	(Get_Arguments): Comment improved.
	* libgnat/g-comlin.adb (Get_Argument): Implementation taken from
	original Get_Argument and improved.
	(Get_Argument): Calls new routine Get_Argument with additional
	parameter.

From-SVN: r279277