ada: Fix internal error on container aggregate for bounded vectors

The problem is that we analyze references to an object before the actual
subtype of the object is established, thus creating a type mismatch that
is flagged by the code generator.

gcc/ada/ChangeLog:

	* exp_ch7.ads (Store_After_Actions_In_Scope_Without_Analysis): New
	procedure declaration.
	* exp_ch7.adb (Store_New_Actions_In_Scope): New procedure.
	(Store_Actions_In_Scope): Call Store_New_Actions_In_Scope when the
	target list is empty.
	(Store_After_Actions_In_Scope_Without_Analysis): New procedure body.
	* exp_aggr.adb (Expand_Container_Aggregate): For a declaration that
	is wrapped in a transient scope, also defer the analysis of the new
	code until after the declaration is analyzed.