Roll libvpx: cc9c0c:5da40c

Roll libvpx: cc9c0c:5da40c

Cherry-pick potential divide-by-zero fix
https://codereview.chromium.org/877783004

This includes remnants of an attempt to turn on AVX2. That failed and the
critical parts have been reverted. However, the attempt revealed some necessary
changes which have been kept for the next attempt. These constitute a no-op for
this particular roll.

Enable AVX2:
https://codereview.chromium.org/863143002

Fix GN build:
https://codereview.chromium.org/865893004
https://codereview.chromium.org/817293008
https://codereview.chromium.org/866273003

Fix cpu detection:
https://codereview.chromium.org/864393002

Disable AVX2:
https://codereview.chromium.org/880513003

R=tomfinegan@chromium.org
R=yaowu@chromium.org
BUG=396572
Committed: https://crrev.com/09c4610490c2efb0e14a96a12250625bcca94dd6
Cr-Commit-Position: refs/heads/master@{#313182}

[Tom Finegan, 2015-01-26 22:40:13]

lgtm

[Johann, 2015-01-26 22:59:05]

The CQ bit was checked by johannkoenig@google.com

[commit-bot: I haz the power, 2015-01-26 23:00:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/883503002/1

[commit-bot: I haz the power, 2015-01-27 00:53:03]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-27 00:54:46]

Patchset 1 (id:??) landed as
https://crrev.com/09c4610490c2efb0e14a96a12250625bcca94dd6
Cr-Commit-Position: refs/heads/master@{#313182}

[yoichio, 2015-01-27 07:47:47]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/867883006/ by yoichio@chromium.org.

The reason for reverting is: Crashed in Win Vista test.
https://build.chromium.org/p/chromium.win/builders/Vista%20Tests%20%281%29/bu....

[Michael Achenbach, 2015-01-27 11:48:28]

You can add the vista trybot on the next AVX2 change attempt.
E.g. add when rolling:

CQ_INCLUDE_TRYBOTS=tryserver.chromium.win:win_chromium_vista_rel_ng

Or just use the trybot in a chromium patch like this one
https://codereview.chromium.org/866813002/ to test your upstream change before
rolling.

Maybe also this CL is helpful:
https://chromium.googlesource.com/v8/v8/+/65299cf463b054b10b1b4a6709590019d05...

[Johann, 2015-01-27 16:51:17]

On 2015/01/27 11:48:28, Michael Achenbach wrote:
> CQ_INCLUDE_TRYBOTS=tryserver.chromium.win:win_chromium_vista_rel_ng

Thanks. This is the information I was looking for last time.