Revert of Filter invalid slots out from the SlotsBuffer after marking.

Revert of Filter invalid slots out from the SlotsBuffer after marking. (patchset #6 id:220001 of https://codereview.chromium.org/1010363005/)

Reason for revert:
Need to revert in order to revert https://codereview.chromium.org/1029323003/

Original issue's description:
> Filter invalid slots out from the SlotsBuffer after marking.
>
> There are two reasons that could cause invalid slots appearance in SlotsBuffer:
> 1) If GC trims "tail" of an array for which it has already recorded a slots and then migrate another object to the "tail".
> 2) Tagged slot could become a double slot after migrating of an object to another map with "shifted" fields (for example as a result of generalizing immutable data property to a data field).
>
> This CL also adds useful machinery that helps triggering incremental write barriers.
>
> BUG=chromium:454297
> LOG=Y
>
> Committed: https://crrev.com/5c47c1c0d3e4a488f190c16a64ee02f5a14e6561
> Cr-Commit-Position: refs/heads/master@{#27423}

TBR=hpayer@chromium.org,erik.corry@gmail.com,ishell@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:454297
Committed: https://crrev.com/4629f8023a56ea4a013757f750132052289800fe
Cr-Commit-Position: refs/heads/master@{#27426}

[Michael Achenbach, 2015-03-24 22:01:00]

Created Revert of Filter invalid slots out from the SlotsBuffer after marking.

[commit-bot: I haz the power, 2015-03-24 22:01:14]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1033453005/1

[commit-bot: I haz the power, 2015-03-24 22:01:26]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-24 22:01:51]

Patchset 1 (id:??) landed as
https://crrev.com/4629f8023a56ea4a013757f750132052289800fe
Cr-Commit-Position: refs/heads/master@{#27426}