2016-07-07  Yannick Moy  <moy@adacore.com>

	* sem_ch6.adb (Process_Formals): Set ghost flag
	on formal entities of ghost subprograms.
	* ghost.adb (Check_Ghost_Context.Is_OK_Ghost_Context): Accept ghost
	entities in use type clauses.

From-SVN: r238106