[turbofan] removed some dead code.

[turbofan] removed some dead code.

In a previous incarnation of live range merging, we needed to cache the
last child in a chain of live ranges. We don't anymore, so removing
unused code.

BUG=

Committed: https://crrev.com/ea9ecff0e36a0947cd0557490203d20bbc0ceafd
Cr-Commit-Position: refs/heads/master@{#32931}

[Mircea Trofin, 2015-12-17 01:38:12]

Description was changed from

==========
[turbofan] removed some dead code.

In a previous incarnation of live range merging, we needed to cache the
last child in a chain of live ranges. We don't anymore, so removing
unused code.

BUG=
==========

to

==========
[turbofan] removed some dead code.

In a previous incarnation of live range merging, we needed to cache the
last child in a chain of live ranges. We don't anymore, so removing
unused code.

BUG=
==========

[Mircea Trofin, 2015-12-17 01:38:12]

mtrofin@chromium.org changed reviewers:
+ bmeurer@chromium.org, jarin@chromium.org

[Benedikt Meurer, 2015-12-17 05:37:04]

lgtm

[mtrofin, 2015-12-17 05:40:23]

The CQ bit was checked by mtrofin@google.com

[commit-bot: I haz the power, 2015-12-17 06:01:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1536523003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1536523003/1

[commit-bot: I haz the power, 2015-12-17 08:48:43]

Description was changed from

==========
[turbofan] removed some dead code.

In a previous incarnation of live range merging, we needed to cache the
last child in a chain of live ranges. We don't anymore, so removing
unused code.

BUG=
==========

to

==========
[turbofan] removed some dead code.

In a previous incarnation of live range merging, we needed to cache the
last child in a chain of live ranges. We don't anymore, so removing
unused code.

BUG=
==========

[commit-bot: I haz the power, 2015-12-17 08:48:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-12-17 08:49:19]

Description was changed from

==========
[turbofan] removed some dead code.

In a previous incarnation of live range merging, we needed to cache the
last child in a chain of live ranges. We don't anymore, so removing
unused code.

BUG=
==========

to

==========
[turbofan] removed some dead code.

In a previous incarnation of live range merging, we needed to cache the
last child in a chain of live ranges. We don't anymore, so removing
unused code.

BUG=

Committed: https://crrev.com/ea9ecff0e36a0947cd0557490203d20bbc0ceafd
Cr-Commit-Position: refs/heads/master@{#32931}
==========

[commit-bot: I haz the power, 2015-12-17 08:49:19]

Patchset 1 (id:??) landed as
https://crrev.com/ea9ecff0e36a0947cd0557490203d20bbc0ceafd
Cr-Commit-Position: refs/heads/master@{#32931}