ada: Implement built-in-place expansion of container aggregates

It is implemented for container aggregates that are used to initialize an
object, as specified by RM 7.6(17.2/3-17.3/3) for immutably limited types
and types that need finalization, but for all types like other aggregates.

gcc/ada/ChangeLog:

	* exp_aggr.adb (Expand_Delta_Array_Aggregate): Move declaration.
	(Expand_Delta_Record_Aggregate): Likewise.
	(Expand_Container_Aggregate): Likewise.  Move implementation to
	Build_Container_Aggr_Code.  Implement built-in-place expansion
	for object declarations and allocators.
	(Build_Container_Aggr_Code): New function containing most of the
	code of the original Expand_Container_Aggregate.  Do not build a
	temporary for the size calculation.  Minor formatting tweaks.
	(Expand_N_Aggregate): Add comment.
	* exp_ch4.adb (Expand_Allocator_Expression): Detect the case of
	a container aggregate as qualified expression.  Do not apply the
	predicate check on entry in this case and rewrite the allocator.
	* exp_ch7.adb (Build_Finalizer.Process_Object_Declaration): Deal
	with Last_Aggregate_Assignment first to compute the attachment
	point (as already done in Attach_Object_To_Master_Node).

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