ada: Adapt frontend optimization for aggregate assignment

The frontend currently relies on gigi to use efficient assignment in
particular cases like:

  Some_Var.all := (others => (others => 0));

gigi would use memset to clear memory pointed to by Some_Var.

In the case of an access with a Designated_Storage_Model aspect with a Copy_To
procedure, memset can't be used directly. Instead of simply disabling this
frontend/gigi optimization and having the frontend emit several assignments, a
temporary is used (through the new Build_Assignment_With_Temporary): gigi can
still memset it, and this temporary is then copied into the original
target (and the regular storage model mechanism handles it).

gcc/ada/

	* exp_aggr.adb (Build_Assignment_With_Temporary): New.
	(Expand_Array_Aggregate): Tune backend optimization
	and insert a temporary in the case of an access with
	Designated_Storage_Model aspect.
	(Convert_Array_Aggr_In_Allocator): Likewise.

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