Revert of Add CHECKs when updating pointers from the slots and store buffers

Revert of Add CHECKs  when updating pointers from the slots and store buffers (patchset #3 id:40001 of https://codereview.chromium.org/1035763002/)

Reason for revert:
Got one dev-channel with this. Should be enough.

Original issue's description:
> Add CHECKs  when updating pointers from the slots and store buffers
>
> We want to verify that we always overwrite heap objects with heap
> objects, and non-heap objects with non-heap objects
>
> BUG=chromium:452095
> R=hpayer@chromium.org
> LOG=n
>
> Committed: https://crrev.com/58fbcfac8ae82b1241f07e1b8ea81a5973514c11
> Cr-Commit-Position: refs/heads/master@{#27479}

TBR=hpayer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:452095
Committed: https://crrev.com/43394806197eacb80afd642d4e373c3faaa637be
Cr-Commit-Position: refs/heads/master@{#27565}

[jochen (gone - plz use gerrit), 2015-04-01 14:35:17]

Created Revert of Add CHECKs  when updating pointers from the slots and store
buffers

[commit-bot: I haz the power, 2015-04-01 14:35:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1052713002/1

[commit-bot: I haz the power, 2015-04-01 14:35:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-01 14:35:57]

Patchset 1 (id:??) landed as
https://crrev.com/43394806197eacb80afd642d4e373c3faaa637be
Cr-Commit-Position: refs/heads/master@{#27565}