* dv-m68hc11sio.c (m68hc11sio_tx_poll): Always check for

	* dv-m68hc11sio.c (m68hc11sio_tx_poll): Always check for
	pending interrupts.
	* interrupts.c (interrupts_process): Keep track of the last number
	of masked insn cycles.
	(interrupts_initialize): Clear last number of masked insn cycles.
	(interrupts_info): Report them.
	(interrupts_update_pending): Compute clear and set masks of
	interrupts and clear the interrupt bits before setting them
	(due to SCI interrupt sharing).
	* interrupts.h (struct interrupts): New members last_mask_cycles
	and xirq_last_mask_cycles.