Ship promises and weak collections

test/mjsunit/es6/regress/regress-2156.js

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-// Flags: --allow-natives-syntax --harmony-weak-collections
+// Flags: --allow-natives-syntax
 
 var key1 = {};
 var key2 = {};
 var map = new WeakMap;
 
 // Adding hidden properties preserves map sharing. Putting the key into
 // a WeakMap will cause the first hidden property to be added.
 assertTrue(%HaveSameMap(key1, key2));
 map.set(key1, 1);
 map.set(key2, 2);
 assertTrue(%HaveSameMap(key1, key2));