X87: [turbofan] Add support for reinterpreting integers as floating point and vice versa.

X87: [turbofan] Add support for reinterpreting integers as floating point and vice versa.

port c610a22231212b12055c294f55b8f3942127580b (r30849).

original commit message:

BUG=

Committed: https://crrev.com/b785daa704fbf5fc9a63451003722082b0928959
Cr-Commit-Position: refs/heads/master@{#30898}

[chunyang.dai, 2015-09-23 06:24:42]

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

[chunyang.dai, 2015-09-23 06:24:43]

PTAL

[Weiliang, 2015-09-24 03:20:49]

The CQ bit was checked by weiliang.lin@intel.com

[Weiliang, 2015-09-24 03:20:50]

lgtm

[commit-bot: I haz the power, 2015-09-24 03:21:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1362783003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1362783003/1

[commit-bot: I haz the power, 2015-09-24 03:43:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-24 03:44:02]

Patchset 1 (id:??) landed as
https://crrev.com/b785daa704fbf5fc9a63451003722082b0928959
Cr-Commit-Position: refs/heads/master@{#30898}