ada: Resolve compilation issues with container aggregates in draft ACATS B tests

This change set addresses compilation problems encountered in the draft
versions of the following ACATS B tests for container aggregates:

B435001 (container aggregates with Assign_Indexed)
B435002 (container aggregates with Add_Unnamed)
B435003 (container aggregates with Add_Named)
B435004 (container aggregates with Assign_Indexed and Add_Unnamed)

gcc/ada/

	* sem_aggr.adb (Resolve_Iterated_Association): In the case of
	N_Iterated_Element_Associations that have a key expression, issue
	an error if the aggregate type does not have an Add_Named
	operation, and include a reference to RM22 4.3.5(24) in the error
	message. In the case of an N_Component_Association with a
	Defining_Identifer where the "choice" is given by a function call,
	in the creation of the iterator_specification associate a copy of
	Choice as its Name, and remove the call to
	Analyze_Iterator_Specification, which was causing problems with
	the reanalysis of function calls originally given in prefixed form
	that were transformed into function calls in normal (infix) form.
	The iterator_specification will be analyzed later in any case, so
	that call should not be done here. Remove the with and use of
	Sem_Ch5.

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