message: updated typecheck for regex and remove FlowFixMe
diff: @@ -689,9 +689,8 @@ class HasteMap extends EventEmitter {
  */
  _ignore(filePath: Path): boolean {
  const ignorePattern = this._options.ignorePattern;
  - const ignoreMatched =
  - Object.prototype.toString.call(ignorePattern) === '[object RegExp]'
  - ? ignorePattern.test(filePath) // $FlowFixMe
  + const ignoreMatched = ignorePattern instanceof RegExp
  + ? ignorePattern.test(filePath)
  : ignorePattern(filePath);
  return ignoreMatched ||
  