Add 'ThinLTO Linux ToT' buildbot (src part).

Add 'ThinLTO Linux ToT' buildbot (src part).

ThinLTO is a promising scalable approach to LinkTimeOptimization,
that is quickly reaching the production quality:
http://blog.llvm.org/2016/06/thinlto-scalable-and-incremental-lto.html

We would like to evaluate its current state and potentially deploy it
on the platforms where we currently use Full LTO, and potentially on
others platforms too (for which Full LTO was impractical)

This bot will give us a target to hit: when it's green, we'll know that
the remaining parts is to port features we need from full LTO to ThinLTO,
in particular, whole program devirtualization and CFI.

BUG=645295
Committed: https://crrev.com/e0ad700ec399c678e579f4c55a0ef25422589ace
Cr-Commit-Position: refs/heads/master@{#418150}

[krasin1, 2016-09-13 00:58:55]

The CQ bit was checked by krasin@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-09-13 00:59:14]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[krasin1, 2016-09-13 01:04:37]

krasin@chromium.org changed reviewers:
+ dpranke@chromium.org

[Dirk Pranke, 2016-09-13 01:46:18]

lgtm

[krasin1, 2016-09-13 01:48:58]

The CQ bit was unchecked by krasin@chromium.org

[krasin1, 2016-09-13 01:49:28]

The CQ bit was checked by krasin@chromium.org

[commit-bot: I haz the power, 2016-09-13 01:49:49]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-13 02:53:25]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-13 02:56:02]

Description was changed from

==========
Add 'ThinLTO Linux ToT' buildbot (src part).

ThinLTO is a promising scalable approach to LinkTimeOptimization,
that is quickly reaching the production quality:
http://blog.llvm.org/2016/06/thinlto-scalable-and-incremental-lto.html

We would like to evaluate its current state and potentially deploy it
on the platforms where we currently use Full LTO, and potentially on
others platforms too (for which Full LTO was impractical)

This bot will give us a target to hit: when it's green, we'll know that
the remaining parts is to port features we need from full LTO to ThinLTO,
in particular, whole program devirtualization and CFI.

BUG=645295
==========

to

==========
Add 'ThinLTO Linux ToT' buildbot (src part).

ThinLTO is a promising scalable approach to LinkTimeOptimization,
that is quickly reaching the production quality:
http://blog.llvm.org/2016/06/thinlto-scalable-and-incremental-lto.html

We would like to evaluate its current state and potentially deploy it
on the platforms where we currently use Full LTO, and potentially on
others platforms too (for which Full LTO was impractical)

This bot will give us a target to hit: when it's green, we'll know that
the remaining parts is to port features we need from full LTO to ThinLTO,
in particular, whole program devirtualization and CFI.

BUG=645295

Committed: https://crrev.com/e0ad700ec399c678e579f4c55a0ef25422589ace
Cr-Commit-Position: refs/heads/master@{#418150}
==========

[commit-bot: I haz the power, 2016-09-13 02:56:03]

Patchset 1 (id:??) landed as
https://crrev.com/e0ad700ec399c678e579f4c55a0ef25422589ace
Cr-Commit-Position: refs/heads/master@{#418150}