Ship promises and weak collections

test/mjsunit/es6/regress/regress-2034.js

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-// Flags: --harmony-weak-collections
-
 var key = {};
 var map = new WeakMap;
 Object.preventExtensions(key);
 
 // Try querying using frozen key.
 assertFalse(map.has(key));
 assertSame(undefined, map.get(key));
 
 // Try adding using frozen key.
 map.set(key, 1);
 assertTrue(map.has(key));
 assertSame(1, map.get(key));
 
 // Try deleting using frozen key.
 map.delete(key, 1);
 assertFalse(map.has(key));
 assertSame(undefined, map.get(key));