Add dummy implementation for turbofan unsupported platform.

Add dummy implementation for turbofan unsupported platform.

   This function is defined in feb2890711e8072a9550abb89621929816fc9699.
   (https://codereview.chromium.org/892513003).

   original commit message:
    [turbofan] Initial support for Switch.

    Adds Switch and Case operators to TurboFan and handles them
    appropriately in instruction selection and code generation.

BUG=

Committed: https://crrev.com/07c6814d0f2befffc936b804cf00202c510f37af
Cr-Commit-Position: refs/heads/master@{#26533}

[chunyang.dai, 2015-02-09 11:31:04]

chunyang.dai@intel.com changed reviewers:
+ bmeurer@chromium.org, weiliang.lin@intel.com

[chunyang.dai, 2015-02-09 11:31:20]

PTAL.

thanks.

[Benedikt Meurer, 2015-02-09 18:09:35]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2015-02-09 18:09:35]

lgtm

[commit-bot: I haz the power, 2015-02-09 18:10:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/902943005/1

[commit-bot: I haz the power, 2015-02-09 18:43:16]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-09 18:43:34]

Patchset 1 (id:??) landed as
https://crrev.com/07c6814d0f2befffc936b804cf00202c510f37af
Cr-Commit-Position: refs/heads/master@{#26533}