consider new lint: use_logical_or

[pq]

We might consider a lint to encourage the use of a logical-or rather than the equivalent empty case logic.

BAD

switch (shape) {
  case Square():
  case Circle():
    print('Symmetric shape');
  default:
    print('Asymmetric shape');
}

GOOD

switch (shape) {
  case Square() | Circle():
    print('Symmetric shape');
  default:
    print('Asymmetric shape');
}

/cc @munificent @bwilkerson