[Simd128] Add CpuFeatures::SupportsSimd128 method.

[Simd128] Add CpuFeatures::SupportsSimd128 method.
All architectures return false for now.

LOG=N
BUG=v8:4124
Committed: https://crrev.com/f797c4b889ff369d65f71b66c975efc2a521a15c
Cr-Commit-Position: refs/heads/master@{#37649}

[bbudge, 2016-07-08 16:19:01]

bbudge@chromium.org changed reviewers:
+ bmeurer@chromium.org

[Benedikt Meurer, 2016-07-09 17:53:16]

Thanks Bill, LGTM. Sorry for the delay.

[bbudge, 2016-07-09 19:58:19]

On 2016/07/09 17:53:16, Benedikt Meurer wrote:
> Thanks Bill, LGTM. Sorry for the delay.

Hey, no problem. Thanks for the Saturday review!

[bbudge, 2016-07-11 14:59:32]

The CQ bit was checked by bbudge@chromium.org

[bbudge, 2016-07-11 14:59:33]

The patchset sent to the CQ was uploaded after l-g-t-m from bmeurer@chromium.org
Link to the patchset: https://codereview.chromium.org/2135573003/#ps20001
(title: "Rebase.")

[commit-bot: I haz the power, 2016-07-11 14:59:39]

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, 2016-07-11 15:32:40]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-07-11 15:36:50]

Description was changed from

==========
[Simd128] Add CpuFeatures::SupportsSimd128 method.
All architectures return false for now.

LOG=N
BUG=v8:4124
==========

to

==========
[Simd128] Add CpuFeatures::SupportsSimd128 method.
All architectures return false for now.

LOG=N
BUG=v8:4124

Committed: https://crrev.com/f797c4b889ff369d65f71b66c975efc2a521a15c
Cr-Commit-Position: refs/heads/master@{#37649}
==========

[commit-bot: I haz the power, 2016-07-11 15:36:51]

Patchset 2 (id:??) landed as
https://crrev.com/f797c4b889ff369d65f71b66c975efc2a521a15c
Cr-Commit-Position: refs/heads/master@{#37649}