func (s *State) Prog(as obj.As) *obj.Prog {
	p := s.pp.Prog(as)
	if objw.LosesStmtMark(as) {
		return p
	}
	// Float a statement start to the beginning of any same-line run.
	// lineRunStart is reset at block boundaries, which appears to work well.
	if s.lineRunStart == nil || s.lineRunStart.Pos.Line() != p.Pos.Line() {
		s.lineRunStart = p
	} else if p.Pos.IsStmt() == src.PosIsStmt {