Revert 20313 - "Ship promises and weak collections"

test/mjsunit/es6/regress/regress-2829.js

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+// Flags: --harmony-weak-collections
+
 (function test1() {
   var wm1 = new WeakMap();
   wm1.set(Object.prototype, 23);
   assertTrue(wm1.has(Object.prototype));
   Object.freeze(Object.prototype);
 
   var wm2 = new WeakMap();
   var o = {};
   wm2.set(o, 42);
   assertEquals(42, wm2.get(o));
 })();
 
 (function test2() {
   var wm1 = new WeakMap();
   var o1 = {};
   wm1.set(o1, 23);
   assertTrue(wm1.has(o1));
   Object.freeze(o1);
 
   var wm2 = new WeakMap();
   var o2 = Object.create(o1);
   wm2.set(o2, 42);
   assertEquals(42, wm2.get(o2));
 })();