deps: backport a02d97e from v8 upstream

Original commit message:

  Fix --max_old_space_size=4096 integer overflow.

  BUG=v8:3857
  LOG=N

  Review URL: https://codereview.chromium.org/897543002

  Cr-Commit-Position: refs/heads/master@{#26510}

PR-URL: https://github.com/joyent/node/pull/9200


Reviewed-by: Trevor Norris <trev.norris@gmail.com>
Reviewed-by: Julien Gilli <julien.gilli@joyent.com>