Reland "Remove the weak list of array buffers"

Reland "Remove the weak list of array buffers"

Original issue's description:
> Remove the weak list of array buffers
>
> Instead, collect live array buffers during marking and free pointers we
> no longer found.
>
> BUG=v8:3996
> R=hpayer@chromium.org
> LOG=n

BUG=v8:3996
TBR=hpayer@chromium.org
LOG=n

Committed: https://crrev.com/ac1c88a9b27973e6976a9f72ac84a0ebf940293e
Cr-Commit-Position: refs/heads/master@{#28156}

[jochen (gone - plz use gerrit), 2015-04-30 09:50:17]

fyi

I forgot about array buffers with a NULL backing store (and 0 length...)

[jochen (gone - plz use gerrit), 2015-04-30 09:50:24]

The CQ bit was checked by jochen@chromium.org

[commit-bot: I haz the power, 2015-04-30 09:50:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1115853004/20001

[Hannes Payer (out of office), 2015-04-30 10:35:30]

https://codereview.chromium.org/1115853004/diff/20001/src/heap/heap.cc
File src/heap/heap.cc (right):

https://codereview.chromium.org/1115853004/diff/20001/src/heap/heap.cc#newcod...
src/heap/heap.cc:1726: if (!data) return;
How can this one be null?

https://codereview.chromium.org/1115853004/diff/20001/src/heap/heap.cc#newcod...
src/heap/heap.cc:1734: if (!data) return;
This one can only be null in the neuter case right?

[commit-bot: I haz the power, 2015-04-30 10:57:50]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-04-30 10:58:04]

Patchset 2 (id:??) landed as
https://crrev.com/ac1c88a9b27973e6976a9f72ac84a0ebf940293e
Cr-Commit-Position: refs/heads/master@{#28156}

[jochen (gone - plz use gerrit), 2015-04-30 12:01:08]

https://codereview.chromium.org/1115853004/diff/20001/src/heap/heap.cc
File src/heap/heap.cc (right):

https://codereview.chromium.org/1115853004/diff/20001/src/heap/heap.cc#newcod...
src/heap/heap.cc:1726: if (!data) return;
On 2015/04/30 10:35:29, Hannes Payer wrote:
> How can this one be null?

malloc(0) returns 0 as well

https://codereview.chromium.org/1115853004/diff/20001/src/heap/heap.cc#newcod...
src/heap/heap.cc:1734: if (!data) return;
On 2015/04/30 10:35:29, Hannes Payer wrote:
> This one can only be null in the neuter case right?

also for on-heap typed arrays