re PR ada/80117 (Standard'Word_Size is wrong for aarch64 ILP32)

re PR ada/80117 (Standard'Word_Size is wrong for aarch64 ILP32)

	* system-linux-arm.ads (Memory_Size): Use Long_Integer'Size
	instead of Word_Size.

	Revert
	2017-03-28  Andreas Schwab  <schwab@suse.de>

	PR ada/80117
	* system-linux-aarch64-ilp32.ads: New file.
	* gcc-interface/Makefile.in (LIBGNAT_TARGET_PAIRS_COMMON): Rename
	from LIBGNAT_TARGET_PAIRS.
	(LIBGNAT_TARGET_PAIRS_32, LIBGNAT_TARGET_PAIRS_64): Define.
	(LIBGNAT_TARGET_PAIRS): Use LIBGNAT_TARGET_PAIRS_COMMON, and
	LIBGNAT_TARGET_PAIRS_64 or LIBGNAT_TARGET_PAIRS_32 for -mabi=lp64
	or -mabi=ilp32, resp.

From-SVN: r247979