MIPS: Fix disassembler test failures.

MIPS: Fix disassembler test failures.

Don't generate FP64 mode specific instructions in FP32 mode.

TEST=cctest/test-disasm-mips/Type1,
     cctest/test-disasm-mips/CVT_DISSASM

BUG=

Committed: https://crrev.com/76af78e41239e0c2f1893565882c5081d18218e4
Cr-Commit-Position: refs/heads/master@{#32138}

[akos.palfi.imgtec, 2015-11-19 20:53:08]

akos.palfi@imgtec.com changed reviewers:
+ balazs.kilvady@imgtec.com, ishell@chromium.org,
ivica.bogosavljevic@imgtec.com, paul.lind@imgtec.com

[akos.palfi.imgtec, 2015-11-19 20:53:08]

PTAL.

[Igor Sheludko, 2015-11-20 07:50:10]

lgtm

[akos.palfi.imgtec, 2015-11-20 09:23:38]

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

[commit-bot: I haz the power, 2015-11-20 09:23:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1462803003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1462803003/1

[commit-bot: I haz the power, 2015-11-20 09:43:10]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-20 09:43:44]

Patchset 1 (id:??) landed as
https://crrev.com/76af78e41239e0c2f1893565882c5081d18218e4
Cr-Commit-Position: refs/heads/master@{#32138}