This reverts commit d2c093bc.

Reason for revert: looks like it brokes try bot [1].

[1] https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20-%20debug

Original change's description:
> [heap] Support for minor MC marking during incremental marking
> 
> BUG=chromium:651354
> 
> Change-Id: Ia8511723b17936b78b33ea685704237c100648e1
> Reviewed-on: https://chromium-review.googlesource.com/439285
> Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Reviewed-by: Hannes Payer <hpayer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#43422}

TBR=ulan@chromium.org,hpayer@chromium.org,mlippautz@chromium.org,hablich@chromium.org,v8-reviews@googlegroups.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:651354

Change-Id: Ib5bada3ecf9d687568668b9a4ef4682bb665b8e1
Reviewed-on: https://chromium-review.googlesource.com/446977Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43424}