* einfo.ads, einfo.adb New flags No_Predicate_On_Actual and
	No_Dynamic_Predicate_On_Actual, to enforce the generic contract
	on generic units that contain constructs that forbid subtypes
	with predicates.
	* sem_ch3.adb (Analyze_Subtype_Declaration, Process_Subtype):
	Inherit flags indicating the presence of predicates in subtype
	declarations with and without constraints.
	(Inherit_Predicate_Flags): Utility for the above.
	* sem_util.adb (Bad_Predicated_Subtype_Use): In a generic context,
	indicate that the actual cannot have predicates, and preserve
	warning. In an instance, report error if actual has predicates
	and the construct appears in a package declaration.
	* sem_ch12.adb (Diagnose_Predicated_Actual): Report error
	for an actual with predicates, if the corresponding formal
	carries No_Predicate_On_Actual or (in the case of a loop)
	No_Dynamic_Predicate_On_Actual.
	* sem_ch13.adb (Build_Predicate_Functions); Do not build a
	Static_Predicate function if the type is non-static (in the
	presence of previous errors),
	* sem_ch5.adb (Analyze_Loop_Parameter_Specification): Set flag
	No_Dynamic_Predicate_On_Actual in a generic context, to enforce
	generic contract on actuals that cannot have predicates.

From-SVN: r213418