clang: Disable new warning -Wbitfield-width on the ToT bots.

clang: Disable new warning -Wbitfield-width on the ToT bots.

The warning fires quite a bit in Chromium. Disable it at least until the pinned
clang revision also understands the warning flag, to get the ToT bots back
green.

BUG=none
TBR=hans@chromium.org

Committed: https://crrev.com/8f597d66d3808b29d4e73fa4c6751bfbeecaf31c
Cr-Commit-Position: refs/heads/master@{#348833}

[Nico, 2015-09-15 01:14:24]

The CQ bit was checked by thakis@chromium.org

[commit-bot: I haz the power, 2015-09-15 01:15:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1339223002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1339223002/1

[hans, 2015-09-15 02:16:04]

LGTM

If this is mostly firing in protobuf, perhaps we can just fix it?

[Nico, 2015-09-15 02:17:13]

On 2015/09/15 02:16:04, hans wrote:
> LGTM
> 
> If this is mostly firing in protobuf, perhaps we can just fix it?

That'd be nice. I'm still not 100% clear from the review thread if this is
firing intentionally, though.

[commit-bot: I haz the power, 2015-09-15 03:38:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-15 03:39:47]

Patchset 1 (id:??) landed as
https://crrev.com/8f597d66d3808b29d4e73fa4c6751bfbeecaf31c
Cr-Commit-Position: refs/heads/master@{#348833}

[commit-bot: I haz the power, 2015-09-23 12:42:26]

Patchset 1 (id:??) landed as
https://crrev.com/8f597d66d3808b29d4e73fa4c6751bfbeecaf31c
Cr-Commit-Position: refs/heads/master@{#348833}