(Reland: removed the d8 changes, will land them separately.)

The minimal implementation which does something useful. Initial
machinery for serializing / deserializing objects and functions (only
the very simple cases are supported).

For more info, see https://docs.google.com/document/d/1Qierkg3b3klIwCQt-oZCHqhcc1_9DXNIErBwvdpD4wU/edit?usp=sharing

Previous version: Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2716288

TBR=leszeks@chromium.org,syg@chromium.org,hpayer@chromium.org

Bug: v8:11525
Change-Id: Ia61ed7de36f371d931eff68156ab467723915704
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2759510Reviewed-by: Marja Hölttä <marja@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73401}