Revert of Blink-compatible serialization of arrays, both dense and sparse.

Revert of Blink-compatible serialization of arrays, both dense and sparse. (patchset #6 id:100001 of https://codereview.chromium.org/2259633002/ )

Reason for revert:
Broke MIPS compile due to an uninitialization warning:

https://build.chromium.org/p/client.v8.ports/builders/V8%20Mips%20-%20builder/builds/3110/steps/compile/logs/stdio

Original issue's description:
> Blink-compatible serialization of arrays, both dense and sparse.
>
> The current "dense" format is not expressive enough to distinguish between
> an element that is not defined and one that has the value "undefined",
> but in this CL the existing behaviour of Blink is used for such cases.
> Format changes to fix these issues could be made later on.
>
> Not included in this CL is compatibility with version 0 arrays.
> Those will be implemented in a separate CL.
>
> BUG=chromium:148757
>
> Committed: https://crrev.com/2e000127df2e88e31d352ef70af397741d1f2298
> Cr-Commit-Position: refs/heads/master@{#38729}

TBR=jkummerow@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:148757
Committed: https://crrev.com/255971d3ac113845361eb0122e89ca13a7063dda
Cr-Commit-Position: refs/heads/master@{#38730}

[jbroman, 2016-08-18 18:56:45]

The CQ bit was checked by jbroman@chromium.org

[jbroman, 2016-08-18 18:56:46]

Created Revert of Blink-compatible serialization of arrays, both dense and
sparse.

[commit-bot: I haz the power, 2016-08-18 18:56:49]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-18 18:56:50]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-18 18:56:51]

No L-G-T-M from a valid reviewer yet. 
CQ run can only be started by full committers or once the patch has
received an L-G-T-M from a full committer.
Even if an L-G-T-M may have been provided, it was from a non-committer,
_not_ a full super star committer.
Committers are members of the group "project-v8-committers".
Note that this has nothing to do with OWNERS files.

[jbroman, 2016-08-18 19:01:29]

jbroman@chromium.org changed reviewers:
+ adamk@chromium.org

[jbroman, 2016-08-18 19:01:29]

adamk, would you mind stamping this revert as a committer? It's a trivial fix,
but in the spirit of fixing the "client.v8.ports:V8 Mips - builder" bot, it's
probably safer to revert first.

[adamk, 2016-08-18 19:58:23]

The CQ bit was checked by adamk@chromium.org

[adamk, 2016-08-18 19:58:23]

lgtm

[commit-bot: I haz the power, 2016-08-18 19:58:29]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-18 19:58:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-18 19:58:53]

Description was changed from

==========
Revert of Blink-compatible serialization of arrays, both dense and sparse.
(patchset #6 id:100001 of https://codereview.chromium.org/2259633002/ )

Reason for revert:
Broke MIPS compile due to an uninitialization warning:

https://build.chromium.org/p/client.v8.ports/builders/V8%20Mips%20-%20builder...

Original issue's description:
> Blink-compatible serialization of arrays, both dense and sparse.
> 
> The current "dense" format is not expressive enough to distinguish between
> an element that is not defined and one that has the value "undefined",
> but in this CL the existing behaviour of Blink is used for such cases.
> Format changes to fix these issues could be made later on.
> 
> Not included in this CL is compatibility with version 0 arrays.
> Those will be implemented in a separate CL.
> 
> BUG=chromium:148757
> 
> Committed: https://crrev.com/2e000127df2e88e31d352ef70af397741d1f2298
> Cr-Commit-Position: refs/heads/master@{#38729}

TBR=jkummerow@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:148757
==========

to

==========
Revert of Blink-compatible serialization of arrays, both dense and sparse.
(patchset #6 id:100001 of https://codereview.chromium.org/2259633002/ )

Reason for revert:
Broke MIPS compile due to an uninitialization warning:

https://build.chromium.org/p/client.v8.ports/builders/V8%20Mips%20-%20builder...

Original issue's description:
> Blink-compatible serialization of arrays, both dense and sparse.
>
> The current "dense" format is not expressive enough to distinguish between
> an element that is not defined and one that has the value "undefined",
> but in this CL the existing behaviour of Blink is used for such cases.
> Format changes to fix these issues could be made later on.
>
> Not included in this CL is compatibility with version 0 arrays.
> Those will be implemented in a separate CL.
>
> BUG=chromium:148757
>
> Committed: https://crrev.com/2e000127df2e88e31d352ef70af397741d1f2298
> Cr-Commit-Position: refs/heads/master@{#38729}

TBR=jkummerow@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:148757

Committed: https://crrev.com/255971d3ac113845361eb0122e89ca13a7063dda
Cr-Commit-Position: refs/heads/master@{#38730}
==========

[commit-bot: I haz the power, 2016-08-18 19:58:54]

Patchset 1 (id:??) landed as
https://crrev.com/255971d3ac113845361eb0122e89ca13a7063dda
Cr-Commit-Position: refs/heads/master@{#38730}