MIPS: [turbofan] Fix implementation of Float64Min.

MIPS: [turbofan] Fix implementation of Float64Min.

Port d783b763629526a1ec57a9f14caa61d0166efac7

Original commit message:
ARM64's `fmin` and `fmax` instructions don't have the same behaviour as
TurboFan's Float(32|64)(Min|Max) functions.

BUG=4206
LOG=N

Committed: https://crrev.com/803b0c7487ecc09197cc8ba1667a5a0f3100a8d8
Cr-Commit-Position: refs/heads/master@{#29305}

[balazs.kilvady, 2015-06-25 11:39:39]

balazs.kilvady@imgtec.com changed reviewers:
+ akos.palfi@imgtec.com, danno@chromium.org, dusan.milosavljevic@imgtec.com,
jacob.bramley@arm.com, paul.neave@gmail.com

[balazs.kilvady, 2015-06-25 11:39:55]

The CQ bit was checked by balazs.kilvady@imgtec.com to run a CQ dry run

[commit-bot: I haz the power, 2015-06-25 11:40:01]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1204903004/1

[commit-bot: I haz the power, 2015-06-25 12:06:45]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-06-25 12:06:46]

Dry run: This issue passed the CQ dry run.

[paul.l..., 2015-06-25 17:53:22]

paul.lind@imgtec.com changed reviewers:
+ paul.lind@imgtec.com

[paul.l..., 2015-06-25 17:53:22]

lgtm

[balazs.kilvady, 2015-06-25 17:57:58]

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

[commit-bot: I haz the power, 2015-06-25 17:58:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1204903004/1

[commit-bot: I haz the power, 2015-06-25 17:59:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-25 18:00:01]

Patchset 1 (id:??) landed as
https://crrev.com/803b0c7487ecc09197cc8ba1667a5a0f3100a8d8
Cr-Commit-Position: refs/heads/master@{#29305}