[x64] Make use of vucomiss and vucomisd when AVX is enabled.

[x64] Make use of vucomiss and vucomisd when AVX is enabled.

BUG=v8:4406
LOG=N

Committed: https://crrev.com/fc4da977a8e594debdb272f13781bca6026a8dae
Cr-Commit-Position: refs/heads/master@{#31351}

[alph, 2015-10-16 17:52:32]

alph@chromium.org changed reviewers:
+ bmeurer@chromium.org, yurys@chromium.org

[alph, 2015-10-16 17:52:32]

ptal

[yurys, 2015-10-16 18:07:57]

lgtm

[Benedikt Meurer, 2015-10-18 11:25:06]

lgtm

[alph, 2015-10-18 17:45:09]

The CQ bit was checked by alph@chromium.org

[alph, 2015-10-18 17:45:09]

The patchset sent to the CQ was uploaded after l-g-t-m from
bmeurer@chromium.org, yurys@chromium.org
Link to the patchset: https://codereview.chromium.org/1406293003/#ps20001
(title: "rebaseline")

[commit-bot: I haz the power, 2015-10-18 17:45:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1406293003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1406293003/20001

[commit-bot: I haz the power, 2015-10-18 18:06:07]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-10-18 18:06:23]

Patchset 2 (id:??) landed as
https://crrev.com/fc4da977a8e594debdb272f13781bca6026a8dae
Cr-Commit-Position: refs/heads/master@{#31351}