2014-07-29  Robert Dewar  <dewar@adacore.com>

	* gnat_rm.texi: Document pragma Unevaluated_Use_Of_Old.
	* opt.adb: Handle Uneval_Old.
	* opt.ads (Uneval_Old, Uneval_Old_Config): New variables.
	* par-prag.adb: Add dummy entry for pragma Unevaluated_Use_Of_Old.
	* sem.ads (Save_Uneval_Old): New field in Scope_Stack_Entry.
	* sem_attr.adb (Uneval_Old_Msg): New procedure.
	* sem_ch8.adb (Push_Scope): Save Uneval_Old.
	(Pop_Scope): Restore Uneval_Old.
	* sem_prag.adb (Analyze_Pragma, case Unevaluated_Use_Of_Old):
	Implemented.
	* snames.ads-tmpl: Add entries for pragma Unevaluated_Use_Of_Old
	Add entries for Name_Warn, Name_Allow.

From-SVN: r213160