[Ada] Premature freezing of types

[Ada] Premature freezing of types

gcc/ada/

	* exp_ch4.adb (Expand_N_Quantified_Expression): Ensure the type
	of the name of a "for of" loop is frozen.
	* exp_disp.adb (Check_Premature_Freezing): Complete condition to
	take into account a private type completed by another private
	type now that the freezing rule are better implemented.
	* freeze.adb (Freeze_Entity.Freeze_Profile): Do not perform an
	early freeze on types if not in the proper scope. Special case
	expression functions that requires access to the dispatch table.
	(Should_Freeze_Type): New.
	* sem_ch13.adb (Resolve_Aspect_Expressions): Prevent assert
	failure in case of an invalid tree (previous errors detected).
	* sem_res.adb (Resolve): Remove kludge related to entities
	causing incorrect premature freezing.
	* sem_util.adb (Ensure_Minimum_Decoration): Add protection
	against non base types.