Check for semaphore alignment on posix platforms.

Check for semaphore alignment on posix platforms.

BUG=chromium:605349
LOG=NO

Committed: https://crrev.com/8d24472acfaf7e67ca20106cb1f405fc0590c849
Cr-Commit-Position: refs/heads/master@{#35717}

[ulan, 2016-04-22 09:19:00]

ulan@chromium.org changed reviewers:
+ mlippautz@chromium.org

[ulan, 2016-04-22 09:19:00]

PTAL

[Michael Lippautz, 2016-04-22 09:21:31]

lgtm

[ulan, 2016-04-22 09:21:47]

The CQ bit was checked by ulan@chromium.org

[commit-bot: I haz the power, 2016-04-22 09:21:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1912923003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1912923003/1

[commit-bot: I haz the power, 2016-04-22 10:14:56]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-22 19:15:11]

Description was changed from

==========
Check for semaphore alignment on posix platforms.

BUG=chromium:605349
LOG=NO
==========

to

==========
Check for semaphore alignment on posix platforms.

BUG=chromium:605349
LOG=NO

Committed: https://crrev.com/8d24472acfaf7e67ca20106cb1f405fc0590c849
Cr-Commit-Position: refs/heads/master@{#35717}
==========

[commit-bot: I haz the power, 2016-04-22 19:15:12]

Patchset 1 (id:??) landed as
https://crrev.com/8d24472acfaf7e67ca20106cb1f405fc0590c849
Cr-Commit-Position: refs/heads/master@{#35717}

[Michael Hablich, 2016-04-25 08:59:02]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1921533002/ by hablich@chromium.org.

The reason for reverting is: blocks rolling. See
https://bugs.chromium.org/p/chromium/issues/detail?id=605349 for more
information.

This CL only triggers the problem earlier but is not the culprit.

The real bug is under investigation by the GC team..