Pretty-printing used mostly in the debugger now handles more Ada 2022
syntax features. In particular, now it correctly handles expressions like
"[for E of A when E /= X => E]".

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

gcc/ada/

	* sprint.adb (Sprint_Node_Actual): Handle iterator_specification within
	iterated_component_association and iterator_filter within
	iterator_specification.