Weak Map stress test

[David Bruant]

Hi,

I've thought about this test:
-----
var wm = WeakMap();
var key = {}, value = {};

while(true){
  wm.set(key, value);
  key = value;
  value = {};
}
-----
At each loop turn, the reference of the "key" object is lost, so it's
garbage collectable. After a second turn, the "value" object of this
entry becomes garbage-collectable too.

There isn't that much of a conformance test here, but It'd be good to
expect ES engines to survive this test for as long as possible.
I cannot add this test to any official test suite, so if you think it
has value, just take it. I release it as public domain. Do whatever you
cant with it as long as it makes ES engines better in any way.

David
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