MIPS: Fix 'Optimize simulator.'

MIPS: Fix 'Optimize simulator.'

For simulator optimization we modified Instruction::InstructionType() function so a simpler but less complete InstructionType() function used by default. This fix enables the full InstructionType checking to properly decode a dd-constant label as unsupported opcode, rather than aborting.

BUG=chromium:528875
LOG=NO

Committed: https://crrev.com/affd6dfcb5676347025dd8c8899e15fae1c56d53
Cr-Commit-Position: refs/heads/master@{#30644}

[balazs.kilvady, 2015-09-08 18:21:47]

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

[paul.l..., 2015-09-08 18:25:37]

LGTM. But please add the bug number to the issue, so it gets tracked properly.

[balazs.kilvady, 2015-09-08 18:33:50]

The CQ bit was checked by balazs.kilvady@imgtec.com

[commit-bot: I haz the power, 2015-09-08 19:02:41]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1314673010/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1314673010/1

[commit-bot: I haz the power, 2015-09-08 19:32:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-08 19:32:34]

Patchset 1 (id:??) landed as
https://crrev.com/affd6dfcb5676347025dd8c8899e15fae1c56d53
Cr-Commit-Position: refs/heads/master@{#30644}