[turbofan] Add more error reporting to representation changer.

[turbofan] Add more error reporting to representation changer.

BUG=chromium:700883
Review-Url: https://codereview.chromium.org/2750803002
Cr-Commit-Position: refs/heads/master@{#43785}
Committed: https://chromium.googlesource.com/v8/v8/+/39e147593fc617e19d73222a5e1327876eb84483

[Jarin, 2017-03-14 12:01:19]

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

[commit-bot: I haz the power, 2017-03-14 12:01:29]

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, 2017-03-14 12:26:35]

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

[commit-bot: I haz the power, 2017-03-14 12:26:35]

Dry run: This issue passed the CQ dry run.

[Jarin, 2017-03-14 13:27:19]

Description was changed from

==========
[turbofan] Add more error reporting to representation changer.

BUG=chromium:700883
==========

to

==========
[turbofan] Add more error reporting to representation changer.

BUG=chromium:700883
==========

[Jarin, 2017-03-14 13:27:19]

jarin@chromium.org changed reviewers:
+ neis@chromium.org

[Jarin, 2017-03-14 13:27:29]

Could you take a look, please?

[neis, 2017-03-14 13:45:13]

lgtm

[Jarin, 2017-03-14 13:51:15]

The CQ bit was checked by jarin@chromium.org

[commit-bot: I haz the power, 2017-03-14 13:51:22]

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, 2017-03-14 13:54:55]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1489499475647060, "parent_rev":
"801d62d28771914cdd7ac8329d0966fb36ac10a4", "commit_rev":
"39e147593fc617e19d73222a5e1327876eb84483"}

[commit-bot: I haz the power, 2017-03-14 13:54:58]

Description was changed from

==========
[turbofan] Add more error reporting to representation changer.

BUG=chromium:700883
==========

to

==========
[turbofan] Add more error reporting to representation changer.

BUG=chromium:700883

Review-Url: https://codereview.chromium.org/2750803002
Cr-Commit-Position: refs/heads/master@{#43785}
Committed:
https://chromium.googlesource.com/v8/v8/+/39e147593fc617e19d73222a5e1327876eb...
==========

[commit-bot: I haz the power, 2017-03-14 13:54:59]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/39e147593fc617e19d73222a5e1327876eb...