Closes #888

These tests are regression tests for V8 failures at top of tree,
https://bugs.chromium.org/p/v8/issues/detail?id=6015
https://bugs.chromium.org/p/v8/issues/detail?id=6016

Neither issue is present in JSC or SpiderMonkey. They are fixed
by the V8 patch
https://codereview.chromium.org/2717613005