Merged 24038b9357af2c355627272bedfb55a3170d77b0

Revert "[heap] Clean-up keys of oldspace weakmaps during scavenge"

R=leszek@chromium.org

Change-Id: Ic8c8f16cb18432360dc4aed9917fb29e57dc1e14
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1539595
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/7.5.111@{#2}
Cr-Branched-From: 077e49a19671e8951212e13f1f7bcf1f6fc8227c-refs/heads/master@{#60436}