// Leave it argless for now.
	s.setOrig(spill, v)
	vi.spill = spill
	vi.restoreMin = s.sdom[b.ID].entry
	vi.restoreMax = s.sdom[b.ID].exit
	return spill
}

// allocValToReg allocates v to a register selected from regMask and
// returns the register copy of v. Any previous user is kicked out and spilled
// (if necessary). Load code is added at the current pc. If nospill is set the