Revert of Enable ThinLTO for POSIX LTO by default on Linux.

Revert of Enable ThinLTO for POSIX LTO by default on Linux. (patchset #2 id:20001 of https://codereview.chromium.org/2939373002/ )

Reason for revert:
Breaks chromium.perf builder.

BUG=735651
Original issue's description:
> Enable ThinLTO for POSIX LTO by default on Linux.
> 
> This is a reland of the remaining part of
> https://codereview.chromium.org/2831213006 .
> 
> The binary size regression has been addressed by disabling ThinLTO
> whole-program optimizations and improving the quality of unoptimized
> code.
> 
> BUG=660216
> R=thakis@chromium.org,hans@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2939373002
> Cr-Commit-Position: refs/heads/master@{#480144}
> Committed: https://chromium.googlesource.com/chromium/src/+/5cb9983f12f300422c16ba812c2d5cdeb278cb74

TBR=hans@chromium.org,thakis@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=660216
Review-Url: https://codereview.chromium.org/2953943002
Cr-Commit-Position: refs/heads/master@{#481748}
Committed: https://chromium.googlesource.com/chromium/src/+/2be84dd0d41f8247d22bdc8690b5520d6c483a8d

[pcc1, 2017-06-22 21:31:14]

The CQ bit was checked by pcc@chromium.org

[pcc1, 2017-06-22 21:31:15]

Created Revert of Enable ThinLTO for POSIX LTO by default on Linux.

[commit-bot: I haz the power, 2017-06-22 21:31:38]

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, 2017-06-23 00:47:00]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1498167074746800, "parent_rev":
"ffe164964fbdf5b1a7245309b2887d45b96eabf0", "commit_rev":
"2be84dd0d41f8247d22bdc8690b5520d6c483a8d"}

[commit-bot: I haz the power, 2017-06-23 00:47:12]

Description was changed from

==========
Revert of Enable ThinLTO for POSIX LTO by default on Linux. (patchset #2
id:20001 of https://codereview.chromium.org/2939373002/ )

Reason for revert:
Breaks chromium.perf builder.

BUG=735651

Original issue's description:
> Enable ThinLTO for POSIX LTO by default on Linux.
> 
> This is a reland of the remaining part of
> https://codereview.chromium.org/2831213006 .
> 
> The binary size regression has been addressed by disabling ThinLTO
> whole-program optimizations and improving the quality of unoptimized
> code.
> 
> BUG=660216
> R=thakis@chromium.org,hans@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2939373002
> Cr-Commit-Position: refs/heads/master@{#480144}
> Committed:
https://chromium.googlesource.com/chromium/src/+/5cb9983f12f300422c16ba812c2d...

TBR=hans@chromium.org,thakis@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=660216
==========

to

==========
Revert of Enable ThinLTO for POSIX LTO by default on Linux. (patchset #2
id:20001 of https://codereview.chromium.org/2939373002/ )

Reason for revert:
Breaks chromium.perf builder.

BUG=735651

Original issue's description:
> Enable ThinLTO for POSIX LTO by default on Linux.
> 
> This is a reland of the remaining part of
> https://codereview.chromium.org/2831213006 .
> 
> The binary size regression has been addressed by disabling ThinLTO
> whole-program optimizations and improving the quality of unoptimized
> code.
> 
> BUG=660216
> R=thakis@chromium.org,hans@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2939373002
> Cr-Commit-Position: refs/heads/master@{#480144}
> Committed:
https://chromium.googlesource.com/chromium/src/+/5cb9983f12f300422c16ba812c2d...

TBR=hans@chromium.org,thakis@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=660216

Review-Url: https://codereview.chromium.org/2953943002
Cr-Commit-Position: refs/heads/master@{#481748}
Committed:
https://chromium.googlesource.com/chromium/src/+/2be84dd0d41f8247d22bdc8690b5...
==========

[commit-bot: I haz the power, 2017-06-23 00:47:14]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/2be84dd0d41f8247d22bdc8690b5...