Update V8 to version 5.1.56.

Update V8 to version 5.1.56.

Summary of changes available at:
https://chromium.googlesource.com/v8/v8/+log/f31c7877..9af7f428

Please follow these instructions for assigning/CC'ing issues:
https://github.com/v8/v8/wiki/Triaging%20issues

Please close rolling in case of a roll revert:
https://v8-roll.appspot.com/
This only works with a Google account.

TBR=hablich@chromium.org,machenbach@chromium.org,yangguo@chromium.org,vogelheim@chromium.org

[v8-autoroll, 2016-03-07 08:47:43]

The CQ bit was checked by v8-autoroll@chromium.org

[commit-bot: I haz the power, 2016-03-07 08:47:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1768073002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1768073002/1

[commit-bot: I haz the power, 2016-03-07 09:27:01]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-03-07 09:27:02]

Try jobs failed on following builders:
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[v8-autoroll, 2016-03-07 09:30:34]

The CQ bit was checked by v8-autoroll@chromium.org

[commit-bot: I haz the power, 2016-03-07 09:30:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1768073002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1768073002/1

[commit-bot: I haz the power, 2016-03-07 09:46:22]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-03-07 09:46:23]

Try jobs failed on following builders:
  win_chromium_x64_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[Michael Hablich, 2016-03-07 09:50:38]

Description was changed from

==========
Update V8 to version 5.1.56.

Summary of changes available at:
https://chromium.googlesource.com/v8/v8/+log/f31c7877..9af7f428

Please follow these instructions for assigning/CC'ing issues:
https://github.com/v8/v8/wiki/Triaging%20issues

Please close rolling in case of a roll revert:
https://v8-roll.appspot.com/
This only works with a Google account.

TBR=hablich@chromium.org,machenbach@chromium.org,yangguo@chromium.org,vogelhe...
==========

to

==========
Update V8 to version 5.1.56.

Summary of changes available at:
https://chromium.googlesource.com/v8/v8/+log/f31c7877..9af7f428

Please follow these instructions for assigning/CC'ing issues:
https://github.com/v8/v8/wiki/Triaging%20issues

Please close rolling in case of a roll revert:
https://v8-roll.appspot.com/
This only works with a Google account.

TBR=hablich@chromium.org,machenbach@chromium.org,yangguo@chromium.org,vogelhe...
==========