Revert of [turbofan] Small fixes to PipelineStatistics. Collect statistics in tests.

Revert of [turbofan] Small fixes to PipelineStatistics. Collect statistics in tests. (patchset #1 id:1 of https://codereview.chromium.org/1122753002/)

Reason for revert:
[Sheriff] Speculative revert for breaking arm64 nosnap:
http://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20arm64%20-%20sim%20-%20nosnap%20-%20debug%20-%202/builds/2314

Original issue's description:
> [turbofan] Small fixes to PipelineStatistics. Collect statistics in tests.
>
> R=bmeurer@chromium.org
> BUG=
>
> Committed: https://crrev.com/9833844268357590243732a53e2a7fc0dc5fcc9e
> Cr-Commit-Position: refs/heads/master@{#28192}

TBR=bmeurer@chromium.org,titzer@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/d0ed8940fc6c995eba57149b8e8cb214001e8381
Cr-Commit-Position: refs/heads/master@{#28205}

[Michael Achenbach, 2015-05-04 15:38:43]

Created Revert of [turbofan] Small fixes to PipelineStatistics. Collect
statistics in tests.

[commit-bot: I haz the power, 2015-05-04 15:38:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1119963003/1

[commit-bot: I haz the power, 2015-05-04 15:39:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-04 15:40:00]

Patchset 1 (id:??) landed as
https://crrev.com/d0ed8940fc6c995eba57149b8e8cb214001e8381
Cr-Commit-Position: refs/heads/master@{#28205}

[Michael Achenbach, 2015-05-04 16:47:30]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1126603002/ by machenbach@chromium.org.

The reason for reverting is: Revert didn't fix the problem. Maybe it was another
CL..