deps: backport bc2e393 from v8 upstream

Original commit message:

  [tools] Make gen-postmortem-metadata.py more reliable

  Instead of basing matches off of whitespace, walk the
  inheritance chain and include any classes that inherit
  from Object.

  R=machenbach@chromium.org,jkummerow@chromium.org
  NOTRY=true

  Review URL: https://codereview.chromium.org/1435643002

  Cr-Commit-Position: refs/heads/master@{#31964}

This adds some missing classes to postmortem info like
JSMap and JSSet.

PR-URL: https://github.com/nodejs/node/pull/3792


Reviewed-By: Trevor Norris <trev.norris@gmail.com>
Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>