MIPS: Support INTERNAL_REFERENCE_ENCODED in serializer.

MIPS: Support INTERNAL_REFERENCE_ENCODED in serializer.

Add mips support for the changes in https://codereview.chromium.org/1000373003. On mips, these support the long-branch mechanism.

TEST=test-serialize/SerializeToplevelLargeCodeObject
BUG=

Committed: https://crrev.com/cd9b6ec224ba23c0b073ccd4a818d9942720db96
Cr-Commit-Position: refs/heads/master@{#27244}

[paul.l..., 2015-03-17 05:06:28]

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

[paul.l..., 2015-03-17 05:06:29]

PTAL. MIPS reviewers,I omitted support for MacroAssembler::J(Label* L, ...) as
it appears to no longer be used. Please double-check me on this. If that's
correct, I'll remove it altogether in follow-on CL.

[dusmil.imgtec, 2015-03-17 14:36:25]

LGTM, yes the J(Label*, ...) is not used for internal references that are part
of long branches.
Also jr to j optimization on mips32 is not performed on long branches.

[paul.l..., 2015-03-17 16:35:17]

The CQ bit was checked by paul.lind@imgtec.com

[commit-bot: I haz the power, 2015-03-17 16:36:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1014763003/20001

[commit-bot: I haz the power, 2015-03-17 17:00:18]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-03-17 17:00:32]

Patchset 2 (id:??) landed as
https://crrev.com/cd9b6ec224ba23c0b073ccd4a818d9942720db96
Cr-Commit-Position: refs/heads/master@{#27244}