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.

Ref: https://github.com/nodejs/node/pull/3792
PR-URL: https://github.com/nodejs/node/pull/4106


Reviewed-By: bnoordhuis - Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: targos - Michaël Zasso <mic.besace@gmail.com>
Reviewed-By: rvagg - Rod Vagg <rod@vagg.org>