This reports violations for 4 units from gigi.

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

gcc/ada/

	* gcc-interface/trans.cc (gigi): Report a violation of No_Dependence
	on System.Stack_Checking if Stack_Check_Probes_On_Target is not set
	and -fstack-check is specified.
	(build_binary_op_trapv): Report violatiosn of No_Dependence on both
	System.Arith_64 and System.Arith_128.
	(add_decl_expr): If an initialized variable, report a violation of
	No_Dependence on System.Memory_Copy for large aggregate types.
	(gnat_to_gnu) <N_Op_Eq>: Report a violation
	of No_Dependence on System.Memory_Compare for large aggregate types.
	<N_Assignment_Statement>! Report a violation of No_Dependence on
	System.Memory_Set, System.Memory_Move or else System.Memory_Copy for
	large aggregate types.
	* gcc-interface/utils2.cc (maybe_wrap_malloc): Report a violation of
	No_Dependence on System.Memory.
	(maybe_wrap_free): Add GNAT_NODE parameter and report a violation of
	No_Dependence on System.Memory.
	(build_call_alloc_dealloc): Adjust call to maybe_wrap_free.