Make the linux_chromium_cfi_rel_ng trybot more useful.

Make the linux_chromium_cfi_rel_ng trybot more useful.

This change causes the trybot to:
- use ThinLTO
- produce detailed diagnostics
- produce symbolized stack traces.
The goal is to reduce cycle times on the bot, as well as provide more
details when it fails so that its results are more actionable.

Tested by patching a bad cast into one of the base_unittests and
sending a swarming job as described here:
http://dev.chromium.org/developers/testing/isolated-testing/for-swes#TOC-Run-a-test-built-locally-on-Swarming

BUG=732652
R=dpranke@chromium.org

Review-Url: https://codereview.chromium.org/2938383004
Cr-Commit-Position: refs/heads/master@{#480983}
Committed: https://chromium.googlesource.com/chromium/src/+/46233c2b5dc4e33ee7afd24799f2157e0daed2fc

[pcc1, 2017-06-17 03:55:32]

Note that this depends on https://codereview.chromium.org/2943863002

[Dirk Pranke, 2017-06-18 21:19:21]

lgtm

[pcc1, 2017-06-20 20:23:28]

The CQ bit was checked by pcc@chromium.org

[commit-bot: I haz the power, 2017-06-20 20:24:13]

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, 2017-06-20 22:11:44]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1497990208672310, "parent_rev":
"5ceed48c3549686d68ade225a1dc3becfb158427", "commit_rev":
"46233c2b5dc4e33ee7afd24799f2157e0daed2fc"}

[commit-bot: I haz the power, 2017-06-20 22:11:56]

Description was changed from

==========
Make the linux_chromium_cfi_rel_ng trybot more useful.

This change causes the trybot to:
- use ThinLTO
- produce detailed diagnostics
- produce symbolized stack traces.
The goal is to reduce cycle times on the bot, as well as provide more
details when it fails so that its results are more actionable.

Tested by patching a bad cast into one of the base_unittests and
sending a swarming job as described here:
http://dev.chromium.org/developers/testing/isolated-testing/for-swes#TOC-Run-...

BUG=732652
R=dpranke@chromium.org
==========

to

==========
Make the linux_chromium_cfi_rel_ng trybot more useful.

This change causes the trybot to:
- use ThinLTO
- produce detailed diagnostics
- produce symbolized stack traces.
The goal is to reduce cycle times on the bot, as well as provide more
details when it fails so that its results are more actionable.

Tested by patching a bad cast into one of the base_unittests and
sending a swarming job as described here:
http://dev.chromium.org/developers/testing/isolated-testing/for-swes#TOC-Run-...

BUG=732652
R=dpranke@chromium.org

Review-Url: https://codereview.chromium.org/2938383004
Cr-Commit-Position: refs/heads/master@{#480983}
Committed:
https://chromium.googlesource.com/chromium/src/+/46233c2b5dc4e33ee7afd24799f2...
==========

[commit-bot: I haz the power, 2017-06-20 22:11:58]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/46233c2b5dc4e33ee7afd24799f2...