Revert of [heap] Move slot filtering logic into sweeper. (patchset #4 id:60001 of https://codereview.chromium.org/2418773002/ )

Reason for revert:
[Sheriff] Speculative revert for heap corruption on all platforms, e.g.:
https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20-%20debug/builds/12377
https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20-%20debug/builds/12379
https://build.chromium.org/p/client.v8/builders/V8%20Win32/builds/4819
https://build.chromium.org/p/client.v8/builders/V8%20Win32%20-%20nosnap%20-%20shared/builds/16783
https://build.chromium.org/p/client.v8/builders/V8%20Mac64%20-%20debug/builds/10007

Original issue's description:
> [heap] Move slot filtering logic into sweeper.
>
> BUG=chromium:648568
>
> Committed: https://crrev.com/18db69c38c93450c1ae957999fc48c465f111f00
> Cr-Commit-Position: refs/heads/master@{#40267}

TBR=ulan@chromium.org,mlippautz@chromium.org,hpayer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:648568

Review-Url: https://codereview.chromium.org/2418053002
Cr-Commit-Position: refs/heads/master@{#40292}