ada: Rework fix for wrong finalization of qualified aggregate in allocator

ada: Rework fix for wrong finalization of qualified aggregate in allocator

The problem is that there is no easy method to insert an action after an
arbitrary node in the tree, so the original fix does not correctly work
when the allocator is nested in another expression.

Therefore this moves the burden of the insertion from Apply_Predicate_Check
to Expand_Allocator_Expression and restricts the new processing to the case
where it is really required.

gcc/ada/

	* checks.ads (Apply_Predicate_Check): Add Deref boolean parameter.
	* checks.adb (Apply_Predicate_Check): Revert latest change. Use
	Loc local variable to hold the source location. Use a common code
	path for the generic processing and make a dereference if Deref is
	True.
	* exp_ch4.adb (Expand_Allocator_Expression): Compute Aggr_In_Place
	earlier. If it is true, do not call Apply_Predicate_Check on the
	expression on entry but on the temporary on exit with a
	dereference.
	* sem_res.adb (Resolve_Actuals): Add explicit parameter
	association in call to Apply_Predicate_Check.