Enable test coverage for test coverage.

Enable test coverage for test coverage.

R=titzer@chromium.org
TEST=mjsunit/compiler/opt-next-call-turbo

Committed: https://crrev.com/209b771431ad4472a94f3180dcfe34b50f93f053
Cr-Commit-Position: refs/heads/master@{#26192}

[Michael Starzinger, 2015-01-21 10:29:13]

I heard you like test coverage, so I put some test coverage about our test
coverage into our test coverage.

[titzer, 2015-01-21 10:33:26]

lgtm

[Michael Starzinger, 2015-01-21 10:35:35]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2015-01-21 10:36:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/822673003/1

[commit-bot: I haz the power, 2015-01-21 11:55:06]

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

[commit-bot: I haz the power, 2015-01-21 11:55:06]

Try jobs failed on following builders:
  v8_linux_arm_rel on tryserver.v8
(http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm_rel/builds/831)

[Michael Starzinger, 2015-01-21 13:35:16]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2015-01-21 13:36:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/822673003/1

[commit-bot: I haz the power, 2015-01-21 14:07:13]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-21 14:07:31]

Patchset 1 (id:??) landed as
https://crrev.com/209b771431ad4472a94f3180dcfe34b50f93f053
Cr-Commit-Position: refs/heads/master@{#26192}