X87: disable the regress-undefined-nan test case for x87.

X87: disable the regress-undefined-nan test case for x87.

  The reason is when native_context_specialization flag is ture, X87 turbofan
  will hit the known issue that X87 will change a sNaN to qNaN by default. And
  then it will fail when bit-comparing the source (sNaN) and the result (qNaN).

BUG=

Committed: https://crrev.com/b3c719ebbad6c87afefa33a7d0b3f412b2e304db
Cr-Commit-Position: refs/heads/master@{#31530}

[chunyang.dai, 2015-10-23 10:00:47]

chunyang.dai@intel.com changed reviewers:
+ bmeurer@chromium.org, weiliang.lin@intel.com

[chunyang.dai, 2015-10-23 10:00:48]

PTAL.

[Benedikt Meurer, 2015-10-23 11:33:11]

LGTM

[chunyang.dai, 2015-10-23 15:21:59]

The CQ bit was checked by chunyang.dai@intel.com

[commit-bot: I haz the power, 2015-10-23 15:22:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1414733004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1414733004/1

[commit-bot: I haz the power, 2015-10-23 15:48:29]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-23 15:48:44]

Patchset 1 (id:??) landed as
https://crrev.com/b3c719ebbad6c87afefa33a7d0b3f412b2e304db
Cr-Commit-Position: refs/heads/master@{#31530}

[chunyang.dai, 2015-10-26 03:43:50]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1417303005/ by chunyang.dai@intel.com.

The reason for reverting is: because of merge mistake, "regress/" is missed when
skipping one test case for X87.

 "regress/" will be added when relanding it..