[Ada] Crash on limited array object with address clause

[Ada] Crash on limited array object with address clause

gcc/ada/

	* exp_aggr.adb (Convert_Aggr_In_Object_Decl): After expansion of
	the aggregate, the expression can be removed from the
	declaration, except if the object is class-wide, in which case
	the aggregate provides the actual type. In other cases the
	presence of the expression may lead to spurious freezing issue.
	* exp_ch3.adb (Expand_N_Object_Declaration): If the expression
	in the declaration is an aggregate with delayed expansion (as is
	the case for objects of a limited type, or a subsequent address
	specification) the aggregate must be resolved at this point.
	This resolution must not include expansion, because the
	expansion of the enclosing declaration will construct the
	necessary aggregate expansion.