ada: Fix too late finalization of temporary object

ada: Fix too late finalization of temporary object

The problem is that Is_Finalizable_Transient returns false when a transient
object is subject to a renaming by another transient object present in the
same transient scope, thus forcing its finalization to be deferred to the
enclosing scope.  That's not necessary, as only renamings by nontransient
objects serviced by transient scopes need to be rejected by the predicate.

The change also removes now dead code in the finalization machinery.

gcc/ada/

	PR ada/114710
	* exp_ch7.adb (Build_Finalizer.Process_Declarations): Remove dead
	code dealing with renamings.
	* exp_util.ads (Is_Finalizable_Transient): Rename Rel_Node to N.
	* exp_util.adb (Is_Finalizable_Transient): Likewise.
	(Is_Aliased): Remove obsolete code dealing wih EWA nodes and only
	consider renamings present in N itself.
	(Requires_Cleanup_Actions): Remove dead code dealing with renamings.