[stubs] Enforce correct index representation on 64-bit.

[stubs] Enforce correct index representation on 64-bit.

Address computation on 64-bit platforms must be done in Word64, mixing
Word32 here is unsound.

TBR=danno@chromium.org

Committed: https://crrev.com/392c1d8e1150a3a02d0f859eef4bb19c9ffa0698
Cr-Commit-Position: refs/heads/master@{#36428}

[Benedikt Meurer, 2016-05-21 19:15:02]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-05-21 19:15:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1997223002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1997223002/1

[commit-bot: I haz the power, 2016-05-21 19:46:35]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-21 19:49:07]

Description was changed from

==========
[stubs] Enforce correct index representation on 64-bit.

Address computation on 64-bit platforms must be done in Word64, mixing
Word32 here is unsound.

TBR=danno@chromium.org
==========

to

==========
[stubs] Enforce correct index representation on 64-bit.

Address computation on 64-bit platforms must be done in Word64, mixing
Word32 here is unsound.

TBR=danno@chromium.org

Committed: https://crrev.com/392c1d8e1150a3a02d0f859eef4bb19c9ffa0698
Cr-Commit-Position: refs/heads/master@{#36428}
==========

[commit-bot: I haz the power, 2016-05-21 19:49:08]

Patchset 1 (id:??) landed as
https://crrev.com/392c1d8e1150a3a02d0f859eef4bb19c9ffa0698
Cr-Commit-Position: refs/heads/master@{#36428}

[danno, 2016-05-23 08:19:53]

lgtm