MIPS: Implemented PC-relative instructions for R6.

MIPS: Implemented PC-relative instructions for R6.

Added: JIC, BEQZC, JIALC, LDPC, LWPC, ALUIPC, ADDIUPC, ALIGN/DAILGN, LWUPC,
AUIPC, BC, BALC. Additional fixed compact branch offset.

TEST=test-assembler-mips[64]/r6_align, r6_dalign, r6_aluipc, r6_lwpc, r6_jic,
                             r6_beqzc, r6_jialc, r6_addiupc, r6_ldpc, r6_lwupc,
                             r6_auipc, r6_bc, r6_balc
BUG=

Committed: https://crrev.com/f0c4edfdc5ed28258881b683424c672c39b266b3
Cr-Commit-Position: refs/heads/master@{#29143}

[Ilija.Pavlovic1, 2015-06-19 10:39:53]

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

[Ilija.Pavlovic1, 2015-06-19 10:39:54]

This time with right credentials.

[dusmil.imgtec, 2015-06-19 10:40:12]

LGTM.

[Ilija.Pavlovic1, 2015-06-19 10:40:40]

The CQ bit was checked by ilija.pavlovic@imgtec.com

[commit-bot: I haz the power, 2015-06-19 10:40:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1195793002/1

[commit-bot: I haz the power, 2015-06-19 10:40:57]

The author Ilija.Pavlovic@imgtec.com has not signed Google Contributor License
Agreement. Please visit https://cla.developers.google.com to sign and manage
CLA.

[commit-bot: I haz the power, 2015-06-19 11:00:44]

The author Ilija.Pavlovic@imgtec.com has not signed Google Contributor License
Agreement. Please visit https://cla.developers.google.com to sign and manage
CLA.

[commit-bot: I haz the power, 2015-06-19 11:06:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-19 11:06:22]

Patchset 1 (id:??) landed as
https://crrev.com/f0c4edfdc5ed28258881b683424c672c39b266b3
Cr-Commit-Position: refs/heads/master@{#29143}