These flags have been on by default since version 4.9, which has been
in stable Chrome for over a week now, demonstrating that they're
here to stay.
Also moved the tests out of harmony/ and into es6/.
Review URL: https://codereview.chromium.org/1776683003
Cr-Commit-Position: refs/heads/master@{#34692}
This avoids generating different scopes on the two compilation passes, which
results in various delirious side-effects.
There's some cleanup to be done in lazy arrow function parsing, but I'd
rather do that in a separate patch, with this one targeted at fixing the
particular crash.
BUG=chromium:572589
LOG=n
Review URL: https://codereview.chromium.org/1575333004
Cr-Commit-Position: refs/heads/master@{#33311}
