closure compiler output: Set is subclassable

closure-compiler-v20160619-set-subclass.js

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$jscomp.string.endsWith$install();
$jscomp.string.startsWith$install();
$jscomp.string.includes$install();
$jscomp.string.codePointAt$install();
$jscomp.string.repeat$install();
$jscomp.array.values$install();
$jscomp.array.keys$install();
$jscomp.array.entries$install();
module.exports = function() {
  var a = function(a) {
    $jscomp.Set.apply(this, arguments);
  };
  $jscomp.inherits(a, $jscomp.Set);
  var b = new a;
  b.add(123);
  b.add(123);
  return b instanceof a && b.has(123);
};

compat-table/compat-table#832