Fix -INT_MIN integer overflow in itoa_r().

Fix -INT_MIN integer overflow in itoa_r().

BUG=None

Committed: https://crrev.com/ac4d28e9cb934e01ff16a9e67a5f387caa82719f
Cr-Commit-Position: refs/heads/master@{#335702}

[Thiemo Nagel, 2015-06-17 13:28:58]

tnagel@chromium.org changed reviewers:
+ brettw@chromium.org

[Thiemo Nagel, 2015-06-17 13:28:58]

And another one... :)

[Thiemo Nagel, 2015-06-23 09:26:30]

Covered by StackTraceTest.itoa_r unit test.

[brettw, 2015-06-23 16:52:46]

lgtm

[Thiemo Nagel, 2015-06-23 16:56:46]

The CQ bit was checked by tnagel@chromium.org

[commit-bot: I haz the power, 2015-06-23 16:58:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1187063003/1

[commit-bot: I haz the power, 2015-06-23 17:27:56]

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

[commit-bot: I haz the power, 2015-06-23 17:27:57]

Try jobs failed on following builders:
  cast_shell_linux on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/cast_shell_linu...)

[Thiemo Nagel, 2015-06-23 17:53:15]

The CQ bit was checked by tnagel@chromium.org

[commit-bot: I haz the power, 2015-06-23 17:54:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1187063003/1

[commit-bot: I haz the power, 2015-06-23 18:16:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-23 18:17:44]

Patchset 1 (id:??) landed as
https://crrev.com/ac4d28e9cb934e01ff16a9e67a5f387caa82719f
Cr-Commit-Position: refs/heads/master@{#335702}