[Ada] Constraint is ignored on constrained access record component

[Ada] Constraint is ignored on constrained access record component

2019-12-12  Ed Schonberg  <schonberg@adacore.com>

gcc/ada/

	* sem_ch3.adb (Constrain_Access): Remove obsolete comments and
	warning concerning component types of an access type whose
	designated type is a constrained record type. (Such constraints
	were previously ignored). Set scope of itype for component to
	the scope of the enclosing record.
	* sem_ch4.adb: Remove call to Set_Ekind.
	* sem_util.adb (Build_Actual_Subtype_Of_Component): Handle
	components whose type is an access to a constrained
	discriminant, where the constraints may be given by the
	discriminants of the enclosing type. New subprogram
	Build_Access_Record_Constraint.

gcc/testsuite/

	* gnat.dg/warn24.adb: Remove expected warning.

From-SVN: r279281