[turbofan] Run everything after representation selection concurrently.

[turbofan] Run everything after representation selection concurrently.

Further refactor the pipeline to even run the first scheduler (part of
the effect control linearization) concurrently. This temporarily
disables most of the write barrier elimination, but we will get back to
that later.

Drive-by-fix: Remove the dead code from ChangeLowering, and stack
allocate the Typer in the pipeline. Also migrate the AllocateStub to a
native code builtin, so that we have the code object + a handle to it
available all the time.

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel
R=mstarzinger@chromium.org
BUG=v8:4969
LOG=n

Committed: https://crrev.com/d1b3d426ceae45e13ccf30cd4ac6e99e2bb8baf6
Cr-Commit-Position: refs/heads/master@{#35918}

[Benedikt Meurer, 2016-04-28 11:51:16]

bmeurer@chromium.org changed reviewers:
+ mstarzinger@chromium.org

[Benedikt Meurer, 2016-04-28 11:51:16]

Hey Michi,

As discussed, here's the next concurrent step.
Please take a look.

Thanks,
Benedikt

[Michael Starzinger, 2016-04-28 12:18:17]

LGTM.

https://codereview.chromium.org/1926023002/diff/1/src/compiler/change-lowerin...
File src/compiler/change-lowering.cc (right):

https://codereview.chromium.org/1926023002/diff/1/src/compiler/change-lowerin...
src/compiler/change-lowering.cc:101: //    if
(field_type->Is(Type::TaggedSigned()) ||
Can we at least leave a TODO here describing what we plan to do with this dead
code in the near future?

https://codereview.chromium.org/1926023002/diff/1/src/compiler/instruction.cc
File src/compiler/instruction.cc (right):

https://codereview.chromium.org/1926023002/diff/1/src/compiler/instruction.cc...
src/compiler/instruction.cc:519: bit_cast<Handle<HeapObject>
>(static_cast<intptr_t>(value_));
nit: Would it be possible to use the "Handle(T** location)" constructor here?

https://codereview.chromium.org/1926023002/diff/1/src/handles.h
File src/handles.h (right):

https://codereview.chromium.org/1926023002/diff/1/src/handles.h#newcode48
src/handles.h:48: V8_INLINE Address address() const { return
bit_cast<Address>(location_); }
nit: Can we move this down into the Handle class itself?

[Benedikt Meurer, 2016-04-28 12:20:52]

https://codereview.chromium.org/1926023002/diff/1/src/compiler/change-lowerin...
File src/compiler/change-lowering.cc (right):

https://codereview.chromium.org/1926023002/diff/1/src/compiler/change-lowerin...
src/compiler/change-lowering.cc:101: //    if
(field_type->Is(Type::TaggedSigned()) ||
Done

https://codereview.chromium.org/1926023002/diff/1/src/compiler/instruction.cc
File src/compiler/instruction.cc (right):

https://codereview.chromium.org/1926023002/diff/1/src/compiler/instruction.cc...
src/compiler/instruction.cc:519: bit_cast<Handle<HeapObject>
>(static_cast<intptr_t>(value_));
On 2016/04/28 12:18:17, Michael Starzinger wrote:
> nit: Would it be possible to use the "Handle(T** location)" constructor here?

Done.

https://codereview.chromium.org/1926023002/diff/1/src/handles.h
File src/handles.h (right):

https://codereview.chromium.org/1926023002/diff/1/src/handles.h#newcode48
src/handles.h:48: V8_INLINE Address address() const { return
bit_cast<Address>(location_); }
As discussed offline, stays here.

[Benedikt Meurer, 2016-04-28 12:21:24]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2016-04-28 12:21:24]

The patchset sent to the CQ was uploaded after l-g-t-m from
mstarzinger@chromium.org
Link to the patchset: https://codereview.chromium.org/1926023002/#ps20001
(title: "Feedback addressed")

[commit-bot: I haz the power, 2016-04-28 12:21:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1926023002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1926023002/20001

[commit-bot: I haz the power, 2016-04-28 12:53:33]

Committed patchset #2 (id:20001)

[Michael Achenbach, 2016-04-28 13:13:17]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/1925073002/ by machenbach@chromium.org.

The reason for reverting is: [Sheriff] Flaky crashed here and there:
https://build.chromium.org/p/client.v8/builders/V8%20Linux/builds/9867
https://build.chromium.org/p/client.v8/builders/V8%20Linux64/builds/9589
https://build.chromium.org/p/client.v8/builders/V8%20Mac/builds/7679.

[Michael Achenbach, 2016-04-28 13:25:06]

TSAN fails the most:
https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20TSAN/builds/9255

[Benedikt Meurer, 2016-04-28 17:56:44]

Description was changed from

==========
[turbofan] Run everything after representation selection concurrently.

Further refactor the pipeline to even run the first scheduler (part of
the effect control linearization) concurrently. This temporarily
disables most of the write barrier elimination, but we will get back to
that later.
==========

to

==========
[turbofan] Run everything after representation selection concurrently.

Further refactor the pipeline to even run the first scheduler (part of
the effect control linearization) concurrently. This temporarily
disables most of the write barrier elimination, but we will get back to
that later.

R=mstarzinger@chromium.org
CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel
BUG=v8:4969
LOG=n
==========

[Benedikt Meurer, 2016-04-28 17:57:22]

Description was changed from

==========
[turbofan] Run everything after representation selection concurrently.

Further refactor the pipeline to even run the first scheduler (part of
the effect control linearization) concurrently. This temporarily
disables most of the write barrier elimination, but we will get back to
that later.

R=mstarzinger@chromium.org
CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel
BUG=v8:4969
LOG=n
==========

to

==========
[turbofan] Run everything after representation selection concurrently.

Further refactor the pipeline to even run the first scheduler (part of
the effect control linearization) concurrently. This temporarily
disables most of the write barrier elimination, but we will get back to
that later.

Drive-by-fix: Remove the dead code from ChangeLowering, and stack
allocate the Typer in the pipeline.

R=mstarzinger@chromium.org
CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel
BUG=v8:4969
LOG=n
==========

[Benedikt Meurer, 2016-04-28 17:58:16]

Description was changed from

==========
[turbofan] Run everything after representation selection concurrently.

Further refactor the pipeline to even run the first scheduler (part of
the effect control linearization) concurrently. This temporarily
disables most of the write barrier elimination, but we will get back to
that later.

Drive-by-fix: Remove the dead code from ChangeLowering, and stack
allocate the Typer in the pipeline.

R=mstarzinger@chromium.org
CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel
BUG=v8:4969
LOG=n
==========

to

==========
[turbofan] Run everything after representation selection concurrently.

Further refactor the pipeline to even run the first scheduler (part of
the effect control linearization) concurrently. This temporarily
disables most of the write barrier elimination, but we will get back to
that later.

Drive-by-fix: Remove the dead code from ChangeLowering, and stack
allocate the Typer in the pipeline.

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel
R=mstarzinger@chromium.org
BUG=v8:4969
LOG=n
==========

[Benedikt Meurer, 2016-04-28 17:58:55]

Description was changed from

==========
[turbofan] Run everything after representation selection concurrently.

Further refactor the pipeline to even run the first scheduler (part of
the effect control linearization) concurrently. This temporarily
disables most of the write barrier elimination, but we will get back to
that later.

Drive-by-fix: Remove the dead code from ChangeLowering, and stack
allocate the Typer in the pipeline.

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel
R=mstarzinger@chromium.org
BUG=v8:4969
LOG=n
==========

to

==========
[turbofan] Run everything after representation selection concurrently.

Further refactor the pipeline to even run the first scheduler (part of
the effect control linearization) concurrently. This temporarily
disables most of the write barrier elimination, but we will get back to
that later.

Drive-by-fix: Remove the dead code from ChangeLowering, and stack
allocate the Typer in the pipeline. Also migrate the AllocateStub to a
native code builtin, so that we have the code object + a handle to it
available all the time.

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel
R=mstarzinger@chromium.org
BUG=v8:4969
LOG=n
==========

[Benedikt Meurer, 2016-04-28 18:01:13]

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

[commit-bot: I haz the power, 2016-04-28 18:01:22]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1926023002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1926023002/20001

[commit-bot: I haz the power, 2016-04-28 18:34:08]

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

[commit-bot: I haz the power, 2016-04-28 18:34:09]

Dry run: Try jobs failed on following builders:
  v8_linux64_tsan_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_tsan_rel/builds/214)

[Benedikt Meurer, 2016-04-28 18:35:12]

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

[commit-bot: I haz the power, 2016-04-28 18:35:17]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1926023002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1926023002/40001

[commit-bot: I haz the power, 2016-04-28 18:37:49]

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

[commit-bot: I haz the power, 2016-04-28 18:37:50]

Dry run: Try jobs failed on following builders:
  v8_linux_mipsel_compile_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_mipsel_compile_rel...)
  v8_mac_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel_ng/builds/909)

[Benedikt Meurer, 2016-04-28 19:02:16]

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

[commit-bot: I haz the power, 2016-04-28 19:02:18]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1926023002/60001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1926023002/60001

[commit-bot: I haz the power, 2016-04-28 19:04:48]

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

[commit-bot: I haz the power, 2016-04-28 19:04:50]

Dry run: Try jobs failed on following builders:
  v8_android_arm_compile_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_android_arm_compile_rel/...)
  v8_linux_arm64_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm64_rel_ng/build...)
  v8_linux_arm_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm_rel_ng/builds/899)
  v8_linux_mips64el_compile_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_mips64el_compile_r...)
  v8_linux_mipsel_compile_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_mipsel_compile_rel...)
  v8_linux_nodcheck_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_nodcheck_rel_ng/bu...)
  v8_linux_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_rel_ng/builds/5022)
  v8_mac_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel_ng/builds/911)

[Benedikt Meurer, 2016-04-29 18:04:06]

Patchset #3 (id:40001) has been deleted

[Benedikt Meurer, 2016-04-29 18:04:16]

Patchset #3 (id:60001) has been deleted

[Benedikt Meurer, 2016-04-29 18:04:34]

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

[commit-bot: I haz the power, 2016-04-29 18:04:42]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1926023002/80001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1926023002/80001

[commit-bot: I haz the power, 2016-04-29 18:06:11]

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

[commit-bot: I haz the power, 2016-04-29 18:06:12]

Dry run: Try jobs failed on following builders:
  v8_linux_arm64_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm64_rel_ng/build...)
  v8_linux_mips64el_compile_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_mips64el_compile_r...)
  v8_linux_nodcheck_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_nodcheck_rel_ng/bu...)

[Benedikt Meurer, 2016-04-30 18:05:30]

Patchset #3 (id:80001) has been deleted

[Benedikt Meurer, 2016-04-30 18:05:45]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2016-04-30 18:05:45]

The patchset sent to the CQ was uploaded after l-g-t-m from
mstarzinger@chromium.org
Link to the patchset: https://codereview.chromium.org/1926023002/#ps100001
(title: "Fix TSAN issues and some related issues, by using a low-level allocate
primitive.")

[commit-bot: I haz the power, 2016-04-30 18:05:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1926023002/100001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1926023002/100001

[commit-bot: I haz the power, 2016-04-30 18:08:20]

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

[commit-bot: I haz the power, 2016-04-30 18:08:22]

Try jobs failed on following builders:
  v8_android_arm_compile_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_android_arm_compile_rel/...)
  v8_linux64_avx2_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_avx2_rel_ng/buil...)
  v8_linux_arm64_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm64_rel_ng/build...)
  v8_linux_arm_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm_rel_ng/builds/973)
  v8_linux_dbg_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_dbg_ng/builds/5115)
  v8_linux_mips64el_compile_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_mips64el_compile_r...)
  v8_linux_mipsel_compile_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_mipsel_compile_rel...)
  v8_linux_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_rel_ng/builds/5095)
  v8_mac_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel_ng/builds/985)

[Benedikt Meurer, 2016-04-30 18:10:28]

Patchset #3 (id:100001) has been deleted

[Benedikt Meurer, 2016-04-30 18:10:43]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2016-04-30 18:10:43]

The patchset sent to the CQ was uploaded after l-g-t-m from
mstarzinger@chromium.org
Link to the patchset: https://codereview.chromium.org/1926023002/#ps120001
(title: "Fix TSAN issues and some related issues, by using a low-level allocate
primitive.")

[commit-bot: I haz the power, 2016-04-30 18:10:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1926023002/120001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1926023002/120001

[commit-bot: I haz the power, 2016-04-30 18:13:20]

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

[commit-bot: I haz the power, 2016-04-30 18:13:22]

Try jobs failed on following builders:
  v8_android_arm_compile_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_android_arm_compile_rel/...)
  v8_linux64_asan_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_asan_rel_ng/buil...)
  v8_linux64_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_rel_ng/builds/5100)
  v8_linux64_tsan_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_tsan_rel/builds/219)
  v8_linux_arm_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_arm_rel_ng/builds/974)
  v8_linux_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_rel_ng/builds/5096)
  v8_mac_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel_ng/builds/986)

[Benedikt Meurer, 2016-04-30 18:16:57]

Patchset #3 (id:120001) has been deleted

[Benedikt Meurer, 2016-04-30 18:17:06]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2016-04-30 18:17:06]

The patchset sent to the CQ was uploaded after l-g-t-m from
mstarzinger@chromium.org
Link to the patchset: https://codereview.chromium.org/1926023002/#ps140001
(title: "Fix TSAN issues and some related issues, by using a low-level allocate
primitive.")

[commit-bot: I haz the power, 2016-04-30 18:17:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1926023002/140001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1926023002/140001

[Benedikt Meurer, 2016-04-30 18:34:26]

The CQ bit was unchecked by bmeurer@chromium.org

[Benedikt Meurer, 2016-04-30 18:36:58]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2016-04-30 18:36:59]

The patchset sent to the CQ was uploaded after l-g-t-m from
mstarzinger@chromium.org
Link to the patchset: https://codereview.chromium.org/1926023002/#ps160001
(title: "Remove some dead code.")

[commit-bot: I haz the power, 2016-04-30 18:37:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1926023002/160001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1926023002/160001

[commit-bot: I haz the power, 2016-04-30 19:00:43]

Description was changed from

==========
[turbofan] Run everything after representation selection concurrently.

Further refactor the pipeline to even run the first scheduler (part of
the effect control linearization) concurrently. This temporarily
disables most of the write barrier elimination, but we will get back to
that later.

Drive-by-fix: Remove the dead code from ChangeLowering, and stack
allocate the Typer in the pipeline. Also migrate the AllocateStub to a
native code builtin, so that we have the code object + a handle to it
available all the time.

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel
R=mstarzinger@chromium.org
BUG=v8:4969
LOG=n
==========

to

==========
[turbofan] Run everything after representation selection concurrently.

Further refactor the pipeline to even run the first scheduler (part of
the effect control linearization) concurrently. This temporarily
disables most of the write barrier elimination, but we will get back to
that later.

Drive-by-fix: Remove the dead code from ChangeLowering, and stack
allocate the Typer in the pipeline. Also migrate the AllocateStub to a
native code builtin, so that we have the code object + a handle to it
available all the time.

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel
R=mstarzinger@chromium.org
BUG=v8:4969
LOG=n
==========

[commit-bot: I haz the power, 2016-04-30 19:00:45]

Committed patchset #4 (id:160001)

[commit-bot: I haz the power, 2016-05-01 22:02:21]

Description was changed from

==========
[turbofan] Run everything after representation selection concurrently.

Further refactor the pipeline to even run the first scheduler (part of
the effect control linearization) concurrently. This temporarily
disables most of the write barrier elimination, but we will get back to
that later.

Drive-by-fix: Remove the dead code from ChangeLowering, and stack
allocate the Typer in the pipeline. Also migrate the AllocateStub to a
native code builtin, so that we have the code object + a handle to it
available all the time.

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel
R=mstarzinger@chromium.org
BUG=v8:4969
LOG=n
==========

to

==========
[turbofan] Run everything after representation selection concurrently.

Further refactor the pipeline to even run the first scheduler (part of
the effect control linearization) concurrently. This temporarily
disables most of the write barrier elimination, but we will get back to
that later.

Committed: https://crrev.com/e045a06625ceb442e732630e6584191b5e72b6b6
Cr-Commit-Position: refs/heads/master@{#35861}
==========

[commit-bot: I haz the power, 2016-05-01 22:02:22]

Patchset 4 (id:??) landed as
https://crrev.com/e045a06625ceb442e732630e6584191b5e72b6b6
Cr-Commit-Position: refs/heads/master@{#35861}

[commit-bot: I haz the power, 2016-05-01 22:04:14]

Description was changed from

==========
[turbofan] Run everything after representation selection concurrently.

Further refactor the pipeline to even run the first scheduler (part of
the effect control linearization) concurrently. This temporarily
disables most of the write barrier elimination, but we will get back to
that later.

Committed: https://crrev.com/e045a06625ceb442e732630e6584191b5e72b6b6
Cr-Commit-Position: refs/heads/master@{#35861}
==========

to

==========
[turbofan] Run everything after representation selection concurrently.

Further refactor the pipeline to even run the first scheduler (part of
the effect control linearization) concurrently. This temporarily
disables most of the write barrier elimination, but we will get back to
that later.

Drive-by-fix: Remove the dead code from ChangeLowering, and stack
allocate the Typer in the pipeline. Also migrate the AllocateStub to a
native code builtin, so that we have the code object + a handle to it
available all the time.

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel
R=mstarzinger@chromium.org
BUG=v8:4969
LOG=n

Committed: https://crrev.com/d1b3d426ceae45e13ccf30cd4ac6e99e2bb8baf6
Cr-Commit-Position: refs/heads/master@{#35918}
==========

[commit-bot: I haz the power, 2016-05-01 22:04:15]

Patchset 4 (id:??) landed as
https://crrev.com/d1b3d426ceae45e13ccf30cd4ac6e99e2bb8baf6
Cr-Commit-Position: refs/heads/master@{#35918}