tests/test-filelog.py.out

reachableroots: unroll loop that checks if one of parents is reachable

The difference is small, but fewer loops should be better in general:

  revset #0: 0::tip
  0) 0.001609
  1) 0.001510  93%

ERROR: FIXME: This is a known failure of filelog.size for data starting with \1\n
OK.