[Ada] Improve efficiency of small slice assignments of packed arrays

gcc/ada/

	* rtsfind.ads, libgnat/s-bitfie.ads, libgnat/s-bituti.adb,
	libgnat/s-bituti.ads (Fast_Copy_Bitfield): New run-time library
	function to copy bit fields faster than Copy_Bitfield. Cannot be
	called with zero-size bit fields.  Remove obsolete ??? comments
	from s-bituti.adb; we already do "avoid calling this if
	Forwards_OK is False".
	* exp_ch5.adb (Expand_Assign_Array_Loop_Or_Bitfield,
	Expand_Assign_Array_Bitfield_Fast): Generate calls to
	Fast_Copy_Bitfield when appropriate.
	* sem_util.adb, sem_util.ads (Get_Index_Bounds): Two new
	functions for getting the index bounds. These are more
	convenient than the procedure of the same name, because they can
	be used to initialize constants.

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