Upgrade to V8 4.9 in master
V8 4.9 is now stable with launch of Chrome 49 as stable: http://googlechromereleases.blogspot.com/2016/03/stable-channel-update.html
This PR picks up vee-eight-4.9
as a rebase over master
. There are no new commits over #5494.
V8 4.9 brings us up to 91% ES6 support including Destructuring, Proxies and Reflect, Default Parameters, Classes & lexical declarations in sloppy mode, sticky flag on Regular Expressions, customizable Object.prototype.toString output and more. For full details, see: http://v8project.blogspot.de/2016/01/v8-release-49.html
R=@nodejs/v8
CI: https://ci.nodejs.org/job/node-test-pull-request/1826/
CI: https://ci.nodejs.org/job/node-test-pull-request/1828/