Adding x64 simd assembler support.

Adding x64 simd assembler support.

Based on assembler changes from this patch:
https://codereview.chromium.org/90643003/

BUG=https://bugs.chromium.org/p/v8/issues/detail?id=4124
R=titzer@chromium.org,bbudge@chromium.org
LOG=N

Committed: https://crrev.com/fd39fdc5fb7cb78497b7382b5c33dfaedffc6721
Cr-Commit-Position: refs/heads/master@{#36383}

[bradn, 2016-05-19 08:41:24]

bradnelson@google.com changed reviewers:
+ bradnelson@google.com

[titzer, 2016-05-19 08:56:51]

On 2016/05/19 08:41:24, bradn wrote:

lgtm

[bradnelson, 2016-05-19 19:50:55]

The CQ bit was checked by bradnelson@chromium.org

[commit-bot: I haz the power, 2016-05-19 19:51:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1994083003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1994083003/1

[commit-bot: I haz the power, 2016-05-19 19:53:06]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-19 19:54:12]

Description was changed from

==========
Adding x64 simd assembler support.

Based on assembler changes from this patch:
https://codereview.chromium.org/90643003/

BUG=https://bugs.chromium.org/p/v8/issues/detail?id=4124
R=titzer@chromium.org,bbudge@chromium.org
LOG=N
==========

to

==========
Adding x64 simd assembler support.

Based on assembler changes from this patch:
https://codereview.chromium.org/90643003/

BUG=https://bugs.chromium.org/p/v8/issues/detail?id=4124
R=titzer@chromium.org,bbudge@chromium.org
LOG=N

Committed: https://crrev.com/fd39fdc5fb7cb78497b7382b5c33dfaedffc6721
Cr-Commit-Position: refs/heads/master@{#36383}
==========

[commit-bot: I haz the power, 2016-05-19 19:54:14]

Patchset 1 (id:??) landed as
https://crrev.com/fd39fdc5fb7cb78497b7382b5c33dfaedffc6721
Cr-Commit-Position: refs/heads/master@{#36383}