MIPS64: Tweak constants used in seralization process to reflect real state.

MIPS64: Tweak constants used in serialization process to reflect real state.

We do not need to step one instruction further since we do not use Jr to J
optimization anymore for mips64.

TEST=
BUG=

Committed: https://crrev.com/073009e3e80b9978d87df156ba3ac39fd1d7190d
Cr-Commit-Position: refs/heads/master@{#27504}

[dusmil.imgtec, 2015-03-27 16:51:57]

dusan.milosavljevic@imgtec.com changed reviewers:
+ akos.palfi@imgtec.com, balazs.kilvady@imgtec.com, paul.lind@imgtec.com

[paul.l..., 2015-03-27 17:06:44]

LGTM.

[dusmil.imgtec, 2015-03-27 19:21:52]

The CQ bit was unchecked by dusan.milosavljevic@imgtec.com

[dusmil.imgtec, 2015-03-27 19:21:53]

The CQ bit was checked by dusan.milosavljevic@imgtec.com

[commit-bot: I haz the power, 2015-03-27 19:22:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1041833002/1

[commit-bot: I haz the power, 2015-03-27 21:56:38]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-27 21:56:55]

Patchset 1 (id:??) landed as
https://crrev.com/073009e3e80b9978d87df156ba3ac39fd1d7190d
Cr-Commit-Position: refs/heads/master@{#27504}