remove a few sentinals

remove a few sentinals

gas/ChangeLog:

2016-06-25  Trevor Saunders  <tbsaunde+binutils@tbsaunde.org>

	* config/tc-bfin.c (bfin_cpus): Remove sentinal.
	(md_parse_option): Adjust.
	* config/tc-aarch64.c (aarch64_parse_abi): Replace use of a sentinal
	with iteration from 0 to ARRAY_SIZE.
	* config/tc-mcore.c (md_begin): Likewise.
	* config/tc-visium.c (visium_parse_arch): Likewise.

opcodes/ChangeLog:

2016-06-25  Trevor Saunders  <tbsaunde+binutils@tbsaunde.org>

	* mcore-opc.h: Remove sentinal.
	* mcore-dis.c (print_insn_mcore): Adjust.