* config/tc-arm.c (struct arm_it): Add 'imm' field to operands union.
	(OP_I0, OP_I4, OP_I15, OP_I16, OP_I31, OP_I32, OP_I255, OP_Iffff):
	New operand-parser codes.
	(parse_operands): Handle them.
	(do_bfc, do_bfx, do_mov16, do_ssat16, do_usat16): Use parse_operands.
	(do_bfi): Don't call bfci_lsb_and_width.
	(bfci_lsb_and_width, do_sat16): Delete.