Improve ValueSerializer perf regression after 96635558

Improve ValueSerializer perf regression after 96635558

BUG=687196
R=jbroman@chromium.org

Review-Url: https://codereview.chromium.org/2674613002
Cr-Commit-Position: refs/heads/master@{#42938}
Committed: https://chromium.googlesource.com/v8/v8/+/79837f5f6f269cf3579b10d403396b742786fcff

[binji, 2017-02-02 02:12:13]

This seemed to help quite a bit testing on linux-rel. Haven't tested on ARM, so
it may not help us much there.

That said, the perf regression is on a test that serializes one million
undefined values, so maybe the slight perf regression is OK.

[binji, 2017-02-02 02:12:41]

The CQ bit was checked by binji@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2017-02-02 02:12:43]

Dry run: 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, 2017-02-02 02:42:38]

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

[commit-bot: I haz the power, 2017-02-02 02:42:38]

Dry run: This issue passed the CQ dry run.

[jbroman, 2017-02-02 18:30:39]

lgtm

[binji, 2017-02-02 20:21:20]

The CQ bit was checked by binji@chromium.org

[commit-bot: I haz the power, 2017-02-02 20:21:30]

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, 2017-02-02 20:21:31]

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

[commit-bot: I haz the power, 2017-02-02 20:21:32]

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.

[Camillo Bruni, 2017-02-03 22:03:11]

cbruni@chromium.org changed reviewers:
+ cbruni@chromium.org

[Camillo Bruni, 2017-02-03 22:03:12]

lgtm

[binji, 2017-02-04 00:17:33]

The CQ bit was checked by binji@chromium.org

[commit-bot: I haz the power, 2017-02-04 00:17:43]

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, 2017-02-04 00:44:48]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1486167453748670, "parent_rev":
"67fc083aae6e10ef054dca403db4a19671b3a1f9", "commit_rev":
"79837f5f6f269cf3579b10d403396b742786fcff"}

[commit-bot: I haz the power, 2017-02-04 00:44:53]

Description was changed from

==========
Improve ValueSerializer perf regression after 96635558

BUG=687196
R=jbroman@chromium.org
==========

to

==========
Improve ValueSerializer perf regression after 96635558

BUG=687196
R=jbroman@chromium.org

Review-Url: https://codereview.chromium.org/2674613002
Cr-Commit-Position: refs/heads/master@{#42938}
Committed:
https://chromium.googlesource.com/v8/v8/+/79837f5f6f269cf3579b10d403396b74278...
==========

[commit-bot: I haz the power, 2017-02-04 00:44:54]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/79837f5f6f269cf3579b10d403396b74278...