[Ada] Decorate iterated_component_association in SPARK expansion

[Pierre-Marie de Rodat]

When compiling iterated_component_association, the analysis, resolution
and range checking is done when expanding aggregate into assignments.
This is now mirrored in the custom expansion for GNATprove, so that the
backend sees a fully decorated (but unexpanded) AST.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* exp_spark.adb (Expand_SPARK_N_Aggregate,
	Expand_SPARK_Delta_Or_Update): Expand
	Iterated_Component_Association occurring within delta
	aggregates.
	(Expand_SPARK): Apply SPARK-specific expansion to ordinary
	aggregates.
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