par-ch2.adb (P_Expression_Or_Reserved_Word): New routine.

par-ch2.adb (P_Expression_Or_Reserved_Word): New routine.

2016-04-18  Hristian Kirtchev  <kirtchev@adacore.com>

	* par-ch2.adb (P_Expression_Or_Reserved_Word): New routine.
	(P_Pragma): Signal Scan_Pragma_Argument_Association when the use
	of reserved words is OK.
	(Scan_Pragma_Argument_Association):
	Add new formal Reserved_Words_OK and update the comment on
	usage. Code cleanup. Parse an expression or a reserved word in
	identifier form for pragmas Restriction_Warnings and Restrictions
	No_Use_Of_Attribute.
	* restrict.adb (Check_Restriction_No_Use_Of_Attribute):
	Reimplemented.	(Check_Restriction_No_Use_Of_Pragma): Code cleanup.
	(Set_Restriction_No_Specification_Of_Aspect): Properly set the warning
	flag for an aspect.
	(Set_Restriction_No_Use_Of_Attribute): Properly set the warning
	flag for an attribute.	(Set_Restriction_No_Use_Of_Entity):
	Update the parameter profile.
	(Set_Restriction_No_Use_Of_Pragma): Properly set the warning flag for
	a pragma.
	* restrict.ads (Check_Restriction_No_Use_Of_Attribute): Update
	the comment on usage.
	(Set_Restriction_No_Use_Of_Entity): Update the parameter profile.
	* sem_attr.adb (Analyze_Attribute): Check restriction
	No_Use_Of_Attribute.
	* sem_ch13.adb (Analyze_Attribute_Definition_Clause): Check
	restriction No_Use_Of_Attribute before any rewritings have
	taken place.
	* sem_prag.adb (Analyze_Pragma): Check restriction
	No_Use_Of_Pragma before any rewritings have taken place.

From-SVN: r235134