Roll asan_symbolize.py to llvm r218071.

Roll asan_symbolize.py to llvm r218071.

This fixes an issue with missing newlines in stacktraces.

BUG=https://code.google.com/p/address-sanitizer/issues/detail?id=343
TBR=glider@chromium.org
NOTRY=true

Committed: https://crrev.com/f7aef702936dcd93ab4928ead74e3db437c1f862
Cr-Commit-Position: refs/heads/master@{#295531}

[earthdok, 2014-09-18 19:38:14]

The CQ bit was checked by earthdok@chromium.org

[commit-bot: I haz the power, 2014-09-18 19:39:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/584673002/20001

[commit-bot: I haz the power, 2014-09-18 19:41:09]

Committed patchset #2 (id:20001) as e608fc0ff7f84ca04bed228175b0165db48a47cb

[commit-bot: I haz the power, 2014-09-18 19:42:10]

Patchset 2 (id:??) landed as
https://crrev.com/f7aef702936dcd93ab4928ead74e3db437c1f862
Cr-Commit-Position: refs/heads/master@{#295531}

[earthdok, 2014-09-18 19:53:10]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/580233003/ by earthdok@chromium.org.

The reason for reverting is: This requires an accompanying change to the
Chromium-specific wrapper.

NOTRY=true.