Feedback vector: ASAN found memory leaks during AST Numbering pass.

Feedback vector: ASAN found memory leaks during AST Numbering pass.

The cause was dynamic allocation of an accounting structure used to
create/initialize the type feedback vector, done at the end of the
numbering pass. The solution is to Zone-allocate the structure to
bring it's lifetime in line with the compilation unit.

BUG=

Committed: https://crrev.com/7478c5a0cc4baccf30d83e01be8a8dc5cbe65900
Cr-Commit-Position: refs/heads/master@{#27241}

[mvstanton, 2015-03-17 13:43:51]

mvstanton@chromium.org changed reviewers:
+ yangguo@chromium.org

[mvstanton, 2015-03-17 13:43:52]

Hi Yang, here is the CL we just discussed, thanks for the look,
--Michael

[Yang, 2015-03-17 14:05:01]

lgtm

[mvstanton, 2015-03-17 14:20:18]

The CQ bit was checked by mvstanton@chromium.org

[commit-bot: I haz the power, 2015-03-17 14:20:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1014793003/20001

[commit-bot: I haz the power, 2015-03-17 15:16:27]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-03-17 15:16:58]

Patchset 2 (id:??) landed as
https://crrev.com/7478c5a0cc4baccf30d83e01be8a8dc5cbe65900
Cr-Commit-Position: refs/heads/master@{#27241}