MIPS: [turbofan] Initial support for Switch.

MIPS: [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/0b692450c32f42f3859c4e0750310fcc225a29b9
Cr-Commit-Position: refs/heads/master@{#26535}

[akos.palfi.imgtec, 2015-02-10 03:16:10]

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

[akos.palfi.imgtec, 2015-02-10 03:16:10]

PTAL.

[paul.l..., 2015-02-10 03:24:17]

LGTM. This un-breaks the build, but the MIPS dd implementation still has bugs,
so related tests will still fail.

[akos.palfi.imgtec, 2015-02-10 03:25:41]

The CQ bit was checked by akos.palfi@imgtec.com

[commit-bot: I haz the power, 2015-02-10 03:26:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/896973005/20001

[commit-bot: I haz the power, 2015-02-10 04:02:28]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-10 04:03:03]

Patchset 2 (id:??) landed as
https://crrev.com/0b692450c32f42f3859c4e0750310fcc225a29b9
Cr-Commit-Position: refs/heads/master@{#26535}