[X87] [TurboFan] Fix Float32ToFloat64 code generation bug.

[X87] [TurboFan] Fix Float32ToFloat64 code generation bug.

  The CL #34967 (https://codereview.chromium.org/1804243003) and CL #35045 (https://codereview.chromium.org/1825333004)
  exposed one hidden bug in x87 turbofan code generation for Float32ToFloat64.

  This CL fixed this bug.

BUG=

Committed: https://crrev.com/75602673e61bd6f1f1963700927c7b7b1f4cab24
Cr-Commit-Position: refs/heads/master@{#35129}

[zhengxing.li, 2016-03-30 08:30:42]

zhengxing.li@intel.com changed reviewers:
+ chunyang.dai@intel.com, weiliang.lin@intel.com

[zhengxing.li, 2016-03-30 08:30:43]

PTAL, thanks!

[Weiliang, 2016-03-30 09:07:49]

lgtm

[zhengxing.li, 2016-03-30 09:08:32]

The CQ bit was checked by zhengxing.li@intel.com

[commit-bot: I haz the power, 2016-03-30 09:08:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1847493002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1847493002/1

[commit-bot: I haz the power, 2016-03-30 09:32:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-30 09:34:05]

Description was changed from

==========
[X87] [TurboFan] Fix Float32ToFloat64 code generation bug.

  The CL #34967 (https://codereview.chromium.org/1804243003) and CL #35045
(https://codereview.chromium.org/1825333004)
  exposed one hidden bug in x87 turbofan code generation for Float32ToFloat64.

  This CL fixed this bug.

BUG=
==========

to

==========
[X87] [TurboFan] Fix Float32ToFloat64 code generation bug.

  The CL #34967 (https://codereview.chromium.org/1804243003) and CL #35045
(https://codereview.chromium.org/1825333004)
  exposed one hidden bug in x87 turbofan code generation for Float32ToFloat64.

  This CL fixed this bug.

BUG=

Committed: https://crrev.com/75602673e61bd6f1f1963700927c7b7b1f4cab24
Cr-Commit-Position: refs/heads/master@{#35129}
==========

[commit-bot: I haz the power, 2016-03-30 09:34:06]

Patchset 1 (id:??) landed as
https://crrev.com/75602673e61bd6f1f1963700927c7b7b1f4cab24
Cr-Commit-Position: refs/heads/master@{#35129}