// end (which following instructions are appended to).
	callend := call
	progedit(ctxt, callend, newprog)
	for ; callend.Link != nil; callend = callend.Link {
		progedit(ctxt, callend.Link, newprog)
	}

	// The instructions which unspill regs should be preemptible.
	pcdata = ctxt.EndUnsafePoint(callend, newprog, -1)
	unspill := cursym.Func().UnspillRegisterArgs(pcdata, newprog)