X87: Reland: Add unoptimized/optimized variants of MathFloor TF code stub

X87: Reland: Add unoptimized/optimized variants of MathFloor TF code stub

port 737b8573f80deaa1cbaec98f42ecd3e3b56ba901 (r29539)

original commit message:

    - Add a TurboFanIC class, derived from TurboFanCodeStub, that
      automatically distinguishes between versions of the IC called from
      optimized and unoptimized code.
    - Add appropriate InterfaceDescriptors for both the versions of the
      stub called from unoptimized and optimized code
    - Change the MathFloor TF stub generator to output either the
      for-optimized or for-unoptimized version based on the minor_key
      parameter.

BUG=

Committed: https://crrev.com/1b20d50594c5f0ca7097fca9299a36fe89338df5
Cr-Commit-Position: refs/heads/master@{#29628}

[chunyang.dai, 2015-07-14 01:52:08]

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

[chunyang.dai, 2015-07-14 01:52:08]

PTAL

[Weiliang, 2015-07-14 02:02:32]

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

[Weiliang, 2015-07-14 02:02:32]

lgtm

[commit-bot: I haz the power, 2015-07-14 02:02:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1235823002/1

[commit-bot: I haz the power, 2015-07-14 02:28:43]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-14 02:28:57]

Patchset 1 (id:??) landed as
https://crrev.com/1b20d50594c5f0ca7097fca9299a36fe89338df5
Cr-Commit-Position: refs/heads/master@{#29628}