Commits on Feb 5, 2020

1. Bump core-js to v3.6.4 and Babel to 7.8.4 …

   We should upgrade core-js@2 to core-js@3 because the (1) the next major
   release of Babel will do so, and (2) there are many V8 de-optimizations
   in core-js@2 that have been fixed in core-js@3.
   
   See: babel/babel#10746 (comment)
   See: babel/babel#10746 (comment)
   See: https://github.com/zloirock/core-js/blob/master/docs/2019-03-19-core-js-3-babel-and-a-look-into-the-future.md
   
   We also bumped Babel to 7.8.4 because it was only after 7.4 that
   core-js@3 was supported.
   
   See: https://babeljs.io/blog/2019/03/19/7.4.0#core-js-3-7646-https-githubcom-babel-babel-pull-7646

   

   sebinsua committed Feb 5, 2020
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