- Create a new kind of stack slot: emergency_slot. - Add a get_emergency_slot() method which finds a suitable emergency slot given a list of slots already in use. - Use emergency spill slots when schedule_moves needs them.
- Create a new kind of stack slot: emergency_slot. - Add a get_emergency_slot() method which finds a suitable emergency slot given a list of slots already in use. - Use emergency spill slots when schedule_moves needs them.