MIPS: Fix unpredictable random failures after direct api function call.

MIPS: Fix unpredictable random failures after direct api function call.

The use of jalr ra is unpredictable if instruction in branch delay slot
is in next page.

This finally fixes random failures in JS debugger and InteruptRequest tests.

TEST=mjsunit/debug-*,
     cctest/test-api/RequestInterruptTestWithNativeAccessor
BUG=

Committed: https://crrev.com/448ec36491a33111642470ad8b78e99ce3cf1975
Cr-Commit-Position: refs/heads/master@{#29331}

[dusmil.imgtec, 2015-06-26 14:41:07]

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

[dusmil.imgtec, 2015-06-26 14:41:07]

PTAL.

[balazs.kilvady, 2015-06-26 15:50:39]

lgtm

[Michael Achenbach, 2015-06-26 16:20:13]

lgtm (rubber-stamp mjsunit.status)

[dusmil.imgtec, 2015-06-26 16:24:36]

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

[dusmil.imgtec, 2015-06-26 16:24:36]

The patchset sent to the CQ was uploaded after l-g-t-m from
balazs.kilvady@imgtec.com, machenbach@chromium.org
Link to the patchset: https://codereview.chromium.org/1220443002/#ps20001
(title: "Added asserts.")

[commit-bot: I haz the power, 2015-06-26 16:24:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1220443002/20001

[paul.l..., 2015-06-26 16:35:14]

Very nice fix, LGTM.

nit: test-api/RequestInterruptTestWith*Accessor is still on the skip list for
mips eb in cctest.status.

[commit-bot: I haz the power, 2015-06-26 16:54:08]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-06-26 16:54:24]

Patchset 2 (id:??) landed as
https://crrev.com/448ec36491a33111642470ad8b78e99ce3cf1975
Cr-Commit-Position: refs/heads/master@{#29331}