Revert of [turbofan] Restore basic write barrier elimination.

Revert of [turbofan] Restore basic write barrier elimination. (patchset #2 id:20001 of https://codereview.chromium.org/1938993002/ )

Reason for revert:
Breaks WBs that should be there ;)

https://uberchromegw.corp.google.com/i/client.v8/builders/V8%20Linux%20-%20gc%20stress/builds/3305

Will open repro bug asap.

Original issue's description:
> [turbofan] Restore basic write barrier elimination.
>
> Restore the basic write barrier elimination that we used to run as part
> of the simplified lowering phase (in ChangeLowering actually) before, by
> moving the write barrier computation to SimplifiedLowering where we can
> still look at types and consider the heap/isolate, and just update the
> WriteBarrierKind in the FieldAccess/ElementAccess that we later use when
> lowering to a machine Load/Store.
>
> CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel
> R=mstarzinger@chromium.org
> BUG=v8:4969, chromium:608636
> LOG=n
>
> Committed: https://crrev.com/7dcb6ad379fbacbc8bdc8e11a6e50d680ffa3f62
> Cr-Commit-Position: refs/heads/master@{#35969}

TBR=mstarzinger@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4969, chromium:608636
Committed: https://crrev.com/a782e93c617e728cded5ad878de11137a67891b7
Cr-Commit-Position: refs/heads/master@{#35983}

[Michael Lippautz, 2016-05-03 13:44:47]

Created Revert of [turbofan] Restore basic write barrier elimination.

[commit-bot: I haz the power, 2016-05-03 13:44:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1943743003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1943743003/1

[commit-bot: I haz the power, 2016-05-03 13:45:00]

Description was changed from

==========
Revert of [turbofan] Restore basic write barrier elimination. (patchset #2
id:20001 of https://codereview.chromium.org/1938993002/ )

Reason for revert:
Breaks WBs that should be there ;)

https://uberchromegw.corp.google.com/i/client.v8/builders/V8%20Linux%20-%20gc...

Will open repro bug asap.

Original issue's description:
> [turbofan] Restore basic write barrier elimination.
> 
> Restore the basic write barrier elimination that we used to run as part
> of the simplified lowering phase (in ChangeLowering actually) before, by
> moving the write barrier computation to SimplifiedLowering where we can
> still look at types and consider the heap/isolate, and just update the
> WriteBarrierKind in the FieldAccess/ElementAccess that we later use when
> lowering to a machine Load/Store.
> 
> CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel
> R=mstarzinger@chromium.org
> BUG=v8:4969,chromium:608636
> LOG=n
> 
> Committed: https://crrev.com/7dcb6ad379fbacbc8bdc8e11a6e50d680ffa3f62
> Cr-Commit-Position: refs/heads/master@{#35969}

TBR=mstarzinger@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4969,chromium:608636
==========

to

==========
Revert of [turbofan] Restore basic write barrier elimination. (patchset #2
id:20001 of https://codereview.chromium.org/1938993002/ )

Reason for revert:
Breaks WBs that should be there ;)

https://uberchromegw.corp.google.com/i/client.v8/builders/V8%20Linux%20-%20gc...

Will open repro bug asap.

Original issue's description:
> [turbofan] Restore basic write barrier elimination.
> 
> Restore the basic write barrier elimination that we used to run as part
> of the simplified lowering phase (in ChangeLowering actually) before, by
> moving the write barrier computation to SimplifiedLowering where we can
> still look at types and consider the heap/isolate, and just update the
> WriteBarrierKind in the FieldAccess/ElementAccess that we later use when
> lowering to a machine Load/Store.
> 
> CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel
> R=mstarzinger@chromium.org
> BUG=v8:4969,chromium:608636
> LOG=n
> 
> Committed: https://crrev.com/7dcb6ad379fbacbc8bdc8e11a6e50d680ffa3f62
> Cr-Commit-Position: refs/heads/master@{#35969}

TBR=mstarzinger@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4969,chromium:608636
==========

[commit-bot: I haz the power, 2016-05-03 13:45:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-03 13:45:34]

Description was changed from

==========
Revert of [turbofan] Restore basic write barrier elimination. (patchset #2
id:20001 of https://codereview.chromium.org/1938993002/ )

Reason for revert:
Breaks WBs that should be there ;)

https://uberchromegw.corp.google.com/i/client.v8/builders/V8%20Linux%20-%20gc...

Will open repro bug asap.

Original issue's description:
> [turbofan] Restore basic write barrier elimination.
> 
> Restore the basic write barrier elimination that we used to run as part
> of the simplified lowering phase (in ChangeLowering actually) before, by
> moving the write barrier computation to SimplifiedLowering where we can
> still look at types and consider the heap/isolate, and just update the
> WriteBarrierKind in the FieldAccess/ElementAccess that we later use when
> lowering to a machine Load/Store.
> 
> CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel
> R=mstarzinger@chromium.org
> BUG=v8:4969,chromium:608636
> LOG=n
> 
> Committed: https://crrev.com/7dcb6ad379fbacbc8bdc8e11a6e50d680ffa3f62
> Cr-Commit-Position: refs/heads/master@{#35969}

TBR=mstarzinger@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4969,chromium:608636
==========

to

==========
Revert of [turbofan] Restore basic write barrier elimination. (patchset #2
id:20001 of https://codereview.chromium.org/1938993002/ )

Reason for revert:
Breaks WBs that should be there ;)

https://uberchromegw.corp.google.com/i/client.v8/builders/V8%20Linux%20-%20gc...

Will open repro bug asap.

Original issue's description:
> [turbofan] Restore basic write barrier elimination.
>
> Restore the basic write barrier elimination that we used to run as part
> of the simplified lowering phase (in ChangeLowering actually) before, by
> moving the write barrier computation to SimplifiedLowering where we can
> still look at types and consider the heap/isolate, and just update the
> WriteBarrierKind in the FieldAccess/ElementAccess that we later use when
> lowering to a machine Load/Store.
>
> CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux64_tsan_rel
> R=mstarzinger@chromium.org
> BUG=v8:4969,chromium:608636
> LOG=n
>
> Committed: https://crrev.com/7dcb6ad379fbacbc8bdc8e11a6e50d680ffa3f62
> Cr-Commit-Position: refs/heads/master@{#35969}

TBR=mstarzinger@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4969,chromium:608636

Committed: https://crrev.com/a782e93c617e728cded5ad878de11137a67891b7
Cr-Commit-Position: refs/heads/master@{#35983}
==========

[commit-bot: I haz the power, 2016-05-03 13:45:35]

Patchset 1 (id:??) landed as
https://crrev.com/a782e93c617e728cded5ad878de11137a67891b7
Cr-Commit-Position: refs/heads/master@{#35983}

[Michael Lippautz, 2016-05-03 13:54:59]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1943323002/ by mlippautz@chromium.org.

The reason for reverting is: Jakob found the actual issue with the CL and is
going to land the fix after relanding the WB elimination..