Reduce the penalty for spltiting a trivial expr.
Reduce the penalty for spltiting a trivial expr.

STRONGLY_CONNECTED resulted in a few unfortunate biases like the toy
example below:

  x = [
    var for var in sorted(
        looooooooooooooooooong)
    if var
  ]

versus the preferable:

  x = [
    var
    for var in sorted(looooooooooooooooooong)
    if var
  ]

sbc100/yapf,google/yapf,sbc100/yapf,google/yapf