message: Format labels last
  Not semantically significant, but results in nicer formatting for `br`.
diff: @@ -188,12 +188,12 @@ def instr_to_string(instr):
  rhs += ' {}'.format(' '.join(
  '@{}'.format(f) for f in instr['funcs']
  ))
  + if instr.get('args'):
  + rhs += ' {}'.format(' '.join(instr['args']))
  if instr.get('labels'):
  rhs += ' {}'.format(' '.join(
  '.{}'.format(f) for f in instr['labels']
  ))
  - if instr.get('args'):
  - rhs += ' {}'.format(' '.join(instr['args']))
  if 'dest' in instr:
  tyann = ': {}'.format(type_to_str(instr['type'])) \
  if 'type' in instr else ''
  