MIPS64: [turbofan] Initial support for Switch.

MIPS64: [turbofan] Initial support for Switch.

Port feb2890711e8072a9550abb89621929816fc9699

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

BUG=

Committed: https://crrev.com/24026a9944266c10b58917e82c974a7d46867507
Cr-Commit-Position: refs/heads/master@{#26699}

[balazs.kilvady, 2015-02-16 18:47:42]

balazs.kilvady@imgtec.com changed reviewers:
+ akos.palfi@imgtec.com, bmeurer@chromium.org, danno@chromium.org,
dusan.milosavljevic@imgtec.com, gergely.kis@imgtec.com, paul.lind@imgtec.com

[balazs.kilvady, 2015-02-16 18:50:39]

To build V8 mips64el https://codereview.chromium.org/930623003/ also must be
landed.

[akos.palfi.imgtec, 2015-02-17 12:20:32]

Lgtm.

[balazs.kilvady, 2015-02-17 15:35:55]

The CQ bit was checked by balazs.kilvady@imgtec.com

[commit-bot: I haz the power, 2015-02-17 15:36:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/932683002/1

[commit-bot: I haz the power, 2015-02-17 16:19:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-17 16:19:57]

Patchset 1 (id:??) landed as
https://crrev.com/24026a9944266c10b58917e82c974a7d46867507
Cr-Commit-Position: refs/heads/master@{#26699}