Enable ES6 generators

Enable ES6 generators

R=rossberg@chromium.org

BUG=v8:2355
LOG=Y

Committed: https://code.google.com/p/v8/source/detail?r=23974

[rossberg, 2014-09-16 12:15:28]

lgtm

[wingo, 2014-09-16 12:31:02]

Committed patchset #2 manually as 23974 (presubmit successful).

[aandrey, 2014-09-16 14:12:12]

aandrey@chromium.org changed reviewers:
+ aandrey@chromium.org, yangguo@chromium.org

[aandrey, 2014-09-16 14:12:12]

We should provide debugging support for generators before releasing. Can we
prioritize this work (https://code.google.com/p/v8/issues/detail?id=3292)?

[Yang, 2014-09-16 14:14:03]

On 2014/09/16 14:12:12, aandrey wrote:
> We should provide debugging support for generators before releasing. Can we
> prioritize this work (https://code.google.com/p/v8/issues/detail?id=3292)?

I think it's fine to enable it. Generators won't cause the debugger to crash, as
far as we can make sure. The second step of adding specific support should not
block this feature.