MIPS64: Implement AddE lithium instruction to separate integer and address arithmetic.

MIPS64: Implement AddE lithium instruction to separate integer and address arithmetic.

This is required to have sign-extended int32 arithmetic operations by re-landing:
https://codereview.chromium.org/1161713003

TEST=cctest/test-api/ArrayBuffer_JSInternalToExternal
BUG=

Committed: https://crrev.com/d2f5702c56fc9503efdd73931fca81e5f1fd2839
Cr-Commit-Position: refs/heads/master@{#28845}

[dusmil.imgtec, 2015-06-08 15:08:57]

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

[balazs.kilvady, 2015-06-08 16:16:13]

lgtm

[paul.l..., 2015-06-08 16:59:34]

lgtm too.

[dusmil.imgtec, 2015-06-08 17:12:35]

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

[commit-bot: I haz the power, 2015-06-08 17:13:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1153263012/1

[commit-bot: I haz the power, 2015-06-08 18:18:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-08 18:18:41]

Patchset 1 (id:??) landed as
https://crrev.com/d2f5702c56fc9503efdd73931fca81e5f1fd2839
Cr-Commit-Position: refs/heads/master@{#28845}