Revert of Stub out Skia AVX and HSW opts.

Revert of Stub out Skia AVX and HSW opts. (patchset #1 id:1 of https://codereview.chromium.org/2512093003/ )

Reason for revert:
Now that we're guarding against ucrt\math.h in Skia and that's rolled into Chromium, it's as good a time as ever to try turning back on Skia's AVX+ code at head.  (I intend to just leave it stubbed out like this in M56.)

Original issue's description:
> Stub out Skia AVX and HSW opts.
>
> This is hopefully temporary while we mull better options.
>
> BUG=666707
>
> Committed: https://crrev.com/2ea76e2274404af7e53cc4bb5d212b22856ee455
> Cr-Commit-Position: refs/heads/master@{#433407}

TBR=brucedawson@chromium.org,thakis@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=666707
Committed: https://crrev.com/0dcd8a3ef5f7cdcdd556aeeed1db09e86c3e5ae5
Cr-Commit-Position: refs/heads/master@{#434983}

[mtklein_C, 2016-11-29 13:27:12]

The CQ bit was checked by mtklein@chromium.org

[mtklein_C, 2016-11-29 13:27:13]

Created Revert of Stub out Skia AVX and HSW opts.

[commit-bot: I haz the power, 2016-11-29 13:27:35]

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, 2016-11-29 14:24:27]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1480426032957370, "parent_rev":
"a590852d1cbf1ddccfe5927d29fe5e9acaadf633", "commit_rev":
"a78eb3068681b55bf32a3d0a8faeb4d31113cd5d"}

[commit-bot: I haz the power, 2016-11-29 14:24:54]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-29 14:27:09]

Description was changed from

==========
Revert of Stub out Skia AVX and HSW opts. (patchset #1 id:1 of
https://codereview.chromium.org/2512093003/ )

Reason for revert:
Now that we're guarding against ucrt\math.h in Skia and that's rolled into
Chromium, it's as good a time as ever to try turning back on Skia's AVX+ code at
head.  (I intend to just leave it stubbed out like this in M56.)

Original issue's description:
> Stub out Skia AVX and HSW opts.
> 
> This is hopefully temporary while we mull better options.
> 
> BUG=666707
> 
> Committed: https://crrev.com/2ea76e2274404af7e53cc4bb5d212b22856ee455
> Cr-Commit-Position: refs/heads/master@{#433407}

TBR=brucedawson@chromium.org,thakis@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=666707
==========

to

==========
Revert of Stub out Skia AVX and HSW opts. (patchset #1 id:1 of
https://codereview.chromium.org/2512093003/ )

Reason for revert:
Now that we're guarding against ucrt\math.h in Skia and that's rolled into
Chromium, it's as good a time as ever to try turning back on Skia's AVX+ code at
head.  (I intend to just leave it stubbed out like this in M56.)

Original issue's description:
> Stub out Skia AVX and HSW opts.
>
> This is hopefully temporary while we mull better options.
>
> BUG=666707
>
> Committed: https://crrev.com/2ea76e2274404af7e53cc4bb5d212b22856ee455
> Cr-Commit-Position: refs/heads/master@{#433407}

TBR=brucedawson@chromium.org,thakis@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=666707

Committed: https://crrev.com/0dcd8a3ef5f7cdcdd556aeeed1db09e86c3e5ae5
Cr-Commit-Position: refs/heads/master@{#434983}
==========

[commit-bot: I haz the power, 2016-11-29 14:27:10]

Patchset 1 (id:??) landed as
https://crrev.com/0dcd8a3ef5f7cdcdd556aeeed1db09e86c3e5ae5
Cr-Commit-Position: refs/heads/master@{#434983}