Revert of Provide a tagged allocation top pointer.

Revert of Provide a tagged allocation top pointer. (patchset #5 id:80001 of https://codereview.chromium.org/2028633002/ )

Reason for revert:
d8 segfaults on some benchmarks on ia32. Investigating.

Original issue's description:
> Provide a tagged allocation top pointer.
>
> Taking over http://crrev.com/1924223002.
>
> BUG=chromium:606711
> LOG=N
>
> Committed: https://crrev.com/f42c9e93c80fdf57e8f92bb87f6ed927d0ae4028
> Committed: https://crrev.com/c99caf307ba3bb1b1cf08bf4172f503754c41341
> Cr-Original-Commit-Position: refs/heads/master@{#36633}
> Cr-Commit-Position: refs/heads/master@{#36742}

TBR=bmeurer@chromium.org,hpayer@chromium.org,machenbach@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:606711
Committed: https://crrev.com/d8c2b8f98212b07a572f52b39d91b8bcb30f296f
Cr-Commit-Position: refs/heads/master@{#36758}

[epertoso, 2016-06-06 15:11:41]

The CQ bit was checked by epertoso@chromium.org

[epertoso, 2016-06-06 15:11:42]

Created Revert of Provide a tagged allocation top pointer.

[commit-bot: I haz the power, 2016-06-06 15:11:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2035413003/1

[commit-bot: I haz the power, 2016-06-06 15:12:21]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-06 15:12:40]

Description was changed from

==========
Revert of Provide a tagged allocation top pointer. (patchset #5 id:80001 of
https://codereview.chromium.org/2028633002/ )

Reason for revert:
d8 segfaults on some benchmarks on ia32. Investigating.

Original issue's description:
> Provide a tagged allocation top pointer.
> 
> Taking over http://crrev.com/1924223002.
> 
> BUG=chromium:606711
> LOG=N
> 
> Committed: https://crrev.com/f42c9e93c80fdf57e8f92bb87f6ed927d0ae4028
> Committed: https://crrev.com/c99caf307ba3bb1b1cf08bf4172f503754c41341
> Cr-Original-Commit-Position: refs/heads/master@{#36633}
> Cr-Commit-Position: refs/heads/master@{#36742}

TBR=bmeurer@chromium.org,hpayer@chromium.org,machenbach@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:606711
==========

to

==========
Revert of Provide a tagged allocation top pointer. (patchset #5 id:80001 of
https://codereview.chromium.org/2028633002/ )

Reason for revert:
d8 segfaults on some benchmarks on ia32. Investigating.

Original issue's description:
> Provide a tagged allocation top pointer.
>
> Taking over http://crrev.com/1924223002.
>
> BUG=chromium:606711
> LOG=N
>
> Committed: https://crrev.com/f42c9e93c80fdf57e8f92bb87f6ed927d0ae4028
> Committed: https://crrev.com/c99caf307ba3bb1b1cf08bf4172f503754c41341
> Cr-Original-Commit-Position: refs/heads/master@{#36633}
> Cr-Commit-Position: refs/heads/master@{#36742}

TBR=bmeurer@chromium.org,hpayer@chromium.org,machenbach@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:606711

Committed: https://crrev.com/d8c2b8f98212b07a572f52b39d91b8bcb30f296f
Cr-Commit-Position: refs/heads/master@{#36758}
==========

[commit-bot: I haz the power, 2016-06-06 15:12:41]

Patchset 1 (id:??) landed as
https://crrev.com/d8c2b8f98212b07a572f52b39d91b8bcb30f296f
Cr-Commit-Position: refs/heads/master@{#36758}