X87: Add a MathFloor stub generated with TurboFan

X87: Add a MathFloor stub generated with TurboFan

port  abc35080b33cc31e47b9913e64ac99ec687c6b65 (r28339)

original commit message:

    This stub will be used as the basis of a Math.floor-specific CallIC to
    detect and track calls to floor that return -0.

    Along the way:
    - Create a TurboFanCodeStub super class from which the StringLength and
    MathRound TF stubs derive.
    - Fix the ugly hack that passes the first stub parameter as the "this"
    pointer in the the TF-compiled JS function.
    - Fix bugs in the ia32/x64 disassembler.

BUG=

Committed: https://crrev.com/6803006b2d0b77022ece49cd549fa57ca84a45f4
Cr-Commit-Position: refs/heads/master@{#28386}

[chunyang.dai, 2015-05-13 10:26:12]

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

[chunyang.dai, 2015-05-13 10:26:12]

PTAL

[Weiliang, 2015-05-13 10:29:35]

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

[Weiliang, 2015-05-13 10:29:36]

lgtm

[commit-bot: I haz the power, 2015-05-13 10:29:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1134323002/1

[commit-bot: I haz the power, 2015-05-13 11:14:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-13 11:14:47]

Patchset 1 (id:??) landed as
https://crrev.com/6803006b2d0b77022ece49cd549fa57ca84a45f4
Cr-Commit-Position: refs/heads/master@{#28386}