[ignition] Make a DCHECK in ConstantArrayBuilder more useful

[ignition] Make a DCHECK in ConstantArrayBuilder more useful

This triggered on a CL I was working on today, figured I'd share
my work.

R=mythria@chromium.org, rmcilroy@chromium.org

Review-Url: https://codereview.chromium.org/2601213002
Cr-Commit-Position: refs/heads/master@{#42043}
Committed: https://chromium.googlesource.com/v8/v8/+/a0eb5ab5fc79a2a14aeecab07e0e960249d39e0e

[adamk, 2016-12-29 01:14:32]

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

[commit-bot: I haz the power, 2016-12-29 01:14:43]

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, 2016-12-29 01:49:02]

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

[commit-bot: I haz the power, 2016-12-29 01:49:02]

Dry run: This issue passed the CQ dry run.

[rmcilroy, 2017-01-03 09:39:57]

Awesome, LGTM, thanks

[adamk, 2017-01-03 18:38:39]

The CQ bit was checked by adamk@chromium.org

[commit-bot: I haz the power, 2017-01-03 18:38:45]

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, 2017-01-03 19:05:05]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1483468719460920, "parent_rev":
"c89921258754569147258c33175e9687b1fe4bd2", "commit_rev":
"a0eb5ab5fc79a2a14aeecab07e0e960249d39e0e"}

[commit-bot: I haz the power, 2017-01-03 19:05:10]

Description was changed from

==========
[ignition] Make a DCHECK in ConstantArrayBuilder more useful

This triggered on a CL I was working on today, figured I'd share
my work.

R=mythria@chromium.org, rmcilroy@chromium.org
==========

to

==========
[ignition] Make a DCHECK in ConstantArrayBuilder more useful

This triggered on a CL I was working on today, figured I'd share
my work.

R=mythria@chromium.org, rmcilroy@chromium.org

Review-Url: https://codereview.chromium.org/2601213002
Cr-Commit-Position: refs/heads/master@{#42043}
Committed:
https://chromium.googlesource.com/v8/v8/+/a0eb5ab5fc79a2a14aeecab07e0e960249d...
==========

[commit-bot: I haz the power, 2017-01-03 19:05:11]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/a0eb5ab5fc79a2a14aeecab07e0e960249d...