Refactored the final parts of the TurboFan pipeline a bit.

Refactored the final parts of the TurboFan pipeline a bit.

This removed some inconsistent/duplicated code and made the testing
side entrance much simpler: Now it simply constructs a pipeline and
hands off to the "tail" of the normal pipeline.

R=danno@chromium.org

Committed: https://chromium.googlesource.com/v8/v8/+/e9fd6b083625c8bc253013dd4eda82be81673204

[Sven Panne, 2015-02-13 09:56:05]

svenpanne@chromium.org changed reviewers:
+ danno@chromium.org

[danno, 2015-02-13 10:00:23]

lgtm

[Sven Panne, 2015-02-13 10:08:06]

The CQ bit was checked by svenpanne@chromium.org

[commit-bot: I haz the power, 2015-02-13 10:08:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/924823002/1

[commit-bot: I haz the power, 2015-02-13 10:11:56]

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

[commit-bot: I haz the power, 2015-02-13 10:11:58]

Try jobs failed on following builders:
  v8_linux64_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_rel/builds/2984)

[commit-bot: I haz the power, 2015-02-13 10:35:43]

Patchset 1 (id:??) landed as
https://crrev.com/e9fd6b083625c8bc253013dd4eda82be81673204
Cr-Commit-Position: refs/heads/master@{#26637}

[Sven Panne, 2015-02-13 10:35:44]

Committed patchset #1 (id:1) manually as
e9fd6b083625c8bc253013dd4eda82be81673204 (presubmit successful).