// Not all architectures need the returned instruction, but otherwise
// the boilerplate is common to all.
func (s *State) Br(op obj.As, target *ssa.Block) *obj.Prog {
	p := s.Prog(op)
	p.To.Type = obj.TYPE_BRANCH
	s.Branches = append(s.Branches, Branch{P: p, B: target})
	return p
}

// DebugFriendlySetPosFrom adjusts Pos.IsStmt subject to heuristics
// that reduce "jumpy" line number churn when debugging.