MIPS64: Fix BlockTrampolinePoolFor() to emit trampoline before blocking, if needed.

MIPS64: Fix BlockTrampolinePoolFor() to emit trampoline before blocking, if needed.

Port f0d1106a3fa1ffaa822efc90d61e2aca315cbe15

Fixes possible failure in AssembleArchTableSwitch().

BUG=v8:4294
LOG=y

Committed: https://crrev.com/48995988a996f278887d70bb5d90c58a4ccfe2cd
Cr-Commit-Position: refs/heads/master@{#29621}

[balazs.kilvady, 2015-07-13 17:15:27]

balazs.kilvady@imgtec.com changed reviewers:
+ bmeurer@chromium.org, dusan.milosavljevic@imgtec.com, hablich@chromium.org,
paul.lind@imgtec.com

[paul.l..., 2015-07-13 17:59:11]

LGTM.

[balazs.kilvady, 2015-07-13 18:00:08]

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

[commit-bot: I haz the power, 2015-07-13 18:00:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1235883004/1

[commit-bot: I haz the power, 2015-07-13 18:26:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-13 18:26:45]

Patchset 1 (id:??) landed as
https://crrev.com/48995988a996f278887d70bb5d90c58a4ccfe2cd
Cr-Commit-Position: refs/heads/master@{#29621}