MIPS: Fix QuietSignalingNaNs on mips32r6.

MIPS: Fix QuietSignalingNaNs on mips32r6.

Use the correct sNaN value on mips32r6 also.

TEST=test-api/QuietSignalingNaNs,test-api/Threading1
BUG=

Committed: https://crrev.com/ae3185e390551dd9baabd4373715477f7da378ae
Cr-Commit-Position: refs/heads/master@{#30510}

[akos.palfi.imgtec, 2015-09-01 11:18:25]

akos.palfi@imgtec.com changed reviewers:
+ balazs.kilvady@imgtec.com, bmeurer@chromium.org, mstarzinger@chromium.org,
paul.lind@imgtec.com

[akos.palfi.imgtec, 2015-09-01 11:18:25]

Hi Benedikt, Michael,

This fixes a cctest failure on mips32r6, PTAL.

Thanks,
Akos

[Michael Starzinger, 2015-09-01 11:53:05]

LGTM (rubber-stamped).

[akos.palfi.imgtec, 2015-09-01 12:20:33]

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

[commit-bot: I haz the power, 2015-09-01 12:20:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1311473007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1311473007/1

[commit-bot: I haz the power, 2015-09-01 12:44:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-01 12:44:52]

Patchset 1 (id:??) landed as
https://crrev.com/ae3185e390551dd9baabd4373715477f7da378ae
Cr-Commit-Position: refs/heads/master@{#30510}