[Ada] Syntax error in Ada 2022 array aggregate causes bug box

["Marc Poulhiès" <poulhies@adacore.com>]

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Check for the case where a user writes "in" instead of "of" in an
aggregate like "[for E in Some_Array when Some_Filter (E) => E]".

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

gcc/ada/

	* sem_aggr.adb
	(Resolve_Array_Aggregate): Generate an appropriate error message
	in the case where an error in the source code leads to an
	N_Iterated_Element_Association node in a bad context.

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diff --git a/gcc/ada/sem_aggr.adb b/gcc/ada/sem_aggr.adb
--- a/gcc/ada/sem_aggr.adb
+++ b/gcc/ada/sem_aggr.adb
@@ -1987,6 +1987,11 @@ package body Sem_Aggr is
          while Present (Assoc) loop
             if Nkind (Assoc) = N_Iterated_Component_Association then
                Resolve_Iterated_Component_Association (Assoc, Index_Typ);
+
+            elsif Nkind (Assoc) /= N_Component_Association then
+               Error_Msg_N
+                 ("invalid component association for aggregate", Assoc);
+               return Failure;
             end if;
 
             Choice := First (Choice_List (Assoc));