* arc-dis.c (print_insn_arc_base): Split into big and little fns.

	* arc-dis.c (print_insn_arc_base): Split into big and little fns.
	(print_insn_arc_{host,graphics,audio}): Likewise.
	(print_insn): Add prototype.
	Delete "+ 4" addition to relative branch address.
	(arc_get_disassembler): New arg `big_p'.  Return little or big
	print fn accordingly.
	* arc-opc.c (arc_opcode_init_tables): Init arc_operand_map once.
	(arc_opcode_supported): Use ARC_OPCODE_CPU to ignore byte order.
	(arc_opval_supported): Likewise.
	* disassemble.c (disassembler): Pass big endian flag to
	arc_get_disassembler.