Fix the MachineSignature* parameters change for turbofan unsupported platform.

Fix the MachineSignature* parameters change for turbofan unsupported platform.

   this issue is introduced by 30787d4e564efe7f85182bd5b1b99e9f40e265ca.
   (https://codereview.chromium.org/874693006).

   original commit message:

    Const-corrected some MachineSignature* parameters.

    Recipe: Add "const" to RawMachineAssembler constructor, fix breakage.

BUG=

Committed: https://crrev.com/68db76e1b6b8722ba01a90196f18db86d677c279
Cr-Commit-Position: refs/heads/master@{#26538}

[chunyang.dai, 2015-02-09 11:21:25]

chunyang.dai@intel.com changed reviewers:
+ svenpanne@chromium.org

[chunyang.dai, 2015-02-09 11:21:41]

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

[chunyang.dai, 2015-02-09 11:21:57]

PTAL.

thanks

[Weiliang, 2015-02-10 07:32:33]

weiliang.lin@intel.com changed reviewers:
+ danno@chromium.org, jkummerow@chromium.org

[Weiliang, 2015-02-10 07:32:34]

lgtm

lgtm from me, but still require lgtm from v8 team.

[Sven Panne, 2015-02-10 08:32:42]

The CQ bit was checked by svenpanne@chromium.org

[Sven Panne, 2015-02-10 08:32:43]

lgtm

[commit-bot: I haz the power, 2015-02-10 08:33:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/905283002/1

[commit-bot: I haz the power, 2015-02-10 08:56:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-10 08:56:19]

Patchset 1 (id:??) landed as
https://crrev.com/68db76e1b6b8722ba01a90196f18db86d677c279
Cr-Commit-Position: refs/heads/master@{#26538}