Add a location filter for Test262 integration

[Valerie Young]

For prepack's Test262 filtering

https://github.com/facebook/prepack/blob/master/scripts/test262-runner.js#L1159

function filterFlags(data: BannerData): boolean {
  return !data.flags.includes("async");
}

[Lorin Bond]

Per #125, moving to backlog

[Leo Balter]

renamed to reflect scope, #127 should cover the tags