MIPS64: Enable shorten-64-to-32 warning.

MIPS64: Enable shorten-64-to-32 warning.

Port cdc43bc5fd02fff2905e2e28a79054d0d1eee3ea

Original commit message:
Enable clang's shorten-64-to-32 warning flag on ARM64, and fix the warnings
that arise.

BUG=

Committed: https://crrev.com/9af578a7c83b58a0ce25345998d9287cbf2030cb
Cr-Commit-Position: refs/heads/master@{#28990}

[balazs.kilvady, 2015-05-19 18:40:22]

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

[balazs.kilvady, 2015-05-27 17:12:37]

Patchset #3 (id:40001) has been deleted

[paul.l..., 2015-06-11 18:39:19]

paul.lind@imgtec.com changed reviewers:
+ jkummerow@chromium.org, machenbach@chromium.org

[paul.l..., 2015-06-11 18:39:19]

LGTM. This does need a v8-team review on a standlone.gypi and  platform/time.cc
as well. Can one of you PTAL?

[Sven Panne, 2015-06-12 07:06:20]

svenpanne@chromium.org changed reviewers:
+ svenpanne@chromium.org

[Sven Panne, 2015-06-12 07:06:21]

LGTM with a nit (didn't really look at the platform-dependent parts)

https://codereview.chromium.org/1133163005/diff/220001/src/base/platform/time.cc
File src/base/platform/time.cc (right):

https://codereview.chromium.org/1133163005/diff/220001/src/base/platform/time...
src/base/platform/time.cc:114: ts.tv_sec = static_cast<int>(delta_ /
Time::kMicrosecondsPerSecond);
unsigned int, see:
https://developer.apple.com/library/mac/documentation/Darwin/Conceptual/Kerne...

[balazs.kilvady, 2015-06-12 09:17:44]

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

[balazs.kilvady, 2015-06-12 09:17:45]

The patchset sent to the CQ was uploaded after l-g-t-m from
svenpanne@chromium.org, paul.lind@imgtec.com
Link to the patchset: https://codereview.chromium.org/1133163005/#ps240001
(title: "Fix type related to mach_timespec.")

[commit-bot: I haz the power, 2015-06-12 09:18:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1133163005/240001

[commit-bot: I haz the power, 2015-06-12 09:39:58]

Committed patchset #12 (id:240001)

[commit-bot: I haz the power, 2015-06-12 09:40:13]

Patchset 12 (id:??) landed as
https://crrev.com/9af578a7c83b58a0ce25345998d9287cbf2030cb
Cr-Commit-Position: refs/heads/master@{#28990}

[Yang, 2015-06-12 09:58:01]

A revert of this CL (patchset #12 id:240001) has been created in
https://codereview.chromium.org/1182493007/ by yangguo@chromium.org.

The reason for reverting is: Compile failure:
https://chromegw.corp.google.com/i/client.v8/builders/V8%20Mac64%20-%20debug/....