[parser] Harden DCHECK into CHECK in parser

[parser] Harden DCHECK into CHECK in parser

A DCHECK is guarding something which has previously been a memory
integrity issue. It should be cheap to run. This patch makes it
into a CHECK.

BUG=chromium:658267
Review-Url: https://codereview.chromium.org/2584223002
Cr-Commit-Position: refs/heads/master@{#41825}
Committed: https://chromium.googlesource.com/v8/v8/+/6cc91d6a1336fdfcdd0e7ffea307dbd506a80a4f

[Dan Ehrenberg, 2016-12-18 05:44:25]

littledan@chromium.org changed reviewers:
+ marja@chromium.org

[Dan Ehrenberg, 2016-12-18 06:04:29]

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

[commit-bot: I haz the power, 2016-12-18 06:04:33]

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, 2016-12-18 06:55:02]

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

[commit-bot: I haz the power, 2016-12-18 06:55:03]

Dry run: This issue passed the CQ dry run.

[marja, 2016-12-19 09:32:09]

lgtm

[Dan Ehrenberg, 2016-12-19 21:05:14]

The CQ bit was checked by littledan@chromium.org

[commit-bot: I haz the power, 2016-12-19 21:05:16]

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, 2016-12-19 21:25:53]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1482181514582330, "parent_rev":
"8c6ace9884440c983b86804cde6a7ef8c3e1b4fe", "commit_rev":
"6cc91d6a1336fdfcdd0e7ffea307dbd506a80a4f"}

[commit-bot: I haz the power, 2016-12-19 21:25:59]

Description was changed from

==========
[parser] Harden DCHECK into CHECK in parser

A DCHECK is guarding something which has previously been a memory
integrity issue. It should be cheap to run. This patch makes it
into a CHECK.

BUG=chromium:658267
==========

to

==========
[parser] Harden DCHECK into CHECK in parser

A DCHECK is guarding something which has previously been a memory
integrity issue. It should be cheap to run. This patch makes it
into a CHECK.

BUG=chromium:658267

Review-Url: https://codereview.chromium.org/2584223002
Cr-Commit-Position: refs/heads/master@{#41825}
Committed:
https://chromium.googlesource.com/v8/v8/+/6cc91d6a1336fdfcdd0e7ffea307dbd506a...
==========

[commit-bot: I haz the power, 2016-12-19 21:26:00]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/6cc91d6a1336fdfcdd0e7ffea307dbd506a...