Revert of Sampling heap profiler data structure changes

Revert of Sampling heap profiler data structure changes (patchset #10 id:180001 of https://codereview.chromium.org/1697903002/ )

Reason for revert:
[Sheriff] Speculative revert for cpu profiler crashes on chromebooks:
https://build.chromium.org/p/client.v8/builders/V8%20Arm%20-%20debug/builds/549
https://build.chromium.org/p/client.v8/builders/V8%20Arm%20-%20debug/builds/550

Original issue's description:
> Sampling heap profiler data structure changes
>
> Previously, the sampling heap profiler stored a list of samples and then
> built a tree representation when the profile was queried by calling
> GetAllocationProfile. This change reduces duplication by removing stacks
> from all samples. Also, less information is stored in the tree
> maintained by the profiler and remaining information (script name, line
> no, etc) is resolved when a profile is requested.
>
> BUG=
>
> Committed: https://crrev.com/cdd55e2a3717723492d76f66810bf56b8de7f198
> Cr-Commit-Position: refs/heads/master@{#34119}

TBR=ofrobots@google.com,ulan@chromium.org,hpayer@chromium.org,mattloring@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/4578e52aefb8c4727742ce2e254613e482fdad1f
Cr-Commit-Position: refs/heads/master@{#34128}

[Michael Achenbach, 2016-02-18 19:04:20]

Created Revert of Sampling heap profiler data structure changes

[commit-bot: I haz the power, 2016-02-18 19:04:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1708363002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1708363002/1

[commit-bot: I haz the power, 2016-02-18 19:04:50]

Description was changed from

==========
Revert of Sampling heap profiler data structure changes (patchset #10 id:180001
of https://codereview.chromium.org/1697903002/ )

Reason for revert:
[Sheriff] Speculative revert for cpu profiler crashes on chromebooks:
https://build.chromium.org/p/client.v8/builders/V8%20Arm%20-%20debug/builds/549
https://build.chromium.org/p/client.v8/builders/V8%20Arm%20-%20debug/builds/550

Original issue's description:
> Sampling heap profiler data structure changes
> 
> Previously, the sampling heap profiler stored a list of samples and then
> built a tree representation when the profile was queried by calling
> GetAllocationProfile. This change reduces duplication by removing stacks
> from all samples. Also, less information is stored in the tree
> maintained by the profiler and remaining information (script name, line
> no, etc) is resolved when a profile is requested.
> 
> BUG=
> 
> Committed: https://crrev.com/cdd55e2a3717723492d76f66810bf56b8de7f198
> Cr-Commit-Position: refs/heads/master@{#34119}

TBR=ofrobots@google.com,ulan@chromium.org,hpayer@chromium.org,mattloring@goog...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=
==========

to

==========
Revert of Sampling heap profiler data structure changes (patchset #10 id:180001
of https://codereview.chromium.org/1697903002/ )

Reason for revert:
[Sheriff] Speculative revert for cpu profiler crashes on chromebooks:
https://build.chromium.org/p/client.v8/builders/V8%20Arm%20-%20debug/builds/549
https://build.chromium.org/p/client.v8/builders/V8%20Arm%20-%20debug/builds/550

Original issue's description:
> Sampling heap profiler data structure changes
> 
> Previously, the sampling heap profiler stored a list of samples and then
> built a tree representation when the profile was queried by calling
> GetAllocationProfile. This change reduces duplication by removing stacks
> from all samples. Also, less information is stored in the tree
> maintained by the profiler and remaining information (script name, line
> no, etc) is resolved when a profile is requested.
> 
> BUG=
> 
> Committed: https://crrev.com/cdd55e2a3717723492d76f66810bf56b8de7f198
> Cr-Commit-Position: refs/heads/master@{#34119}

TBR=ofrobots@google.com,ulan@chromium.org,hpayer@chromium.org,mattloring@goog...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=
==========

[commit-bot: I haz the power, 2016-02-18 19:04:51]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-18 19:05:44]

Description was changed from

==========
Revert of Sampling heap profiler data structure changes (patchset #10 id:180001
of https://codereview.chromium.org/1697903002/ )

Reason for revert:
[Sheriff] Speculative revert for cpu profiler crashes on chromebooks:
https://build.chromium.org/p/client.v8/builders/V8%20Arm%20-%20debug/builds/549
https://build.chromium.org/p/client.v8/builders/V8%20Arm%20-%20debug/builds/550

Original issue's description:
> Sampling heap profiler data structure changes
> 
> Previously, the sampling heap profiler stored a list of samples and then
> built a tree representation when the profile was queried by calling
> GetAllocationProfile. This change reduces duplication by removing stacks
> from all samples. Also, less information is stored in the tree
> maintained by the profiler and remaining information (script name, line
> no, etc) is resolved when a profile is requested.
> 
> BUG=
> 
> Committed: https://crrev.com/cdd55e2a3717723492d76f66810bf56b8de7f198
> Cr-Commit-Position: refs/heads/master@{#34119}

TBR=ofrobots@google.com,ulan@chromium.org,hpayer@chromium.org,mattloring@goog...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=
==========

to

==========
Revert of Sampling heap profiler data structure changes (patchset #10 id:180001
of https://codereview.chromium.org/1697903002/ )

Reason for revert:
[Sheriff] Speculative revert for cpu profiler crashes on chromebooks:
https://build.chromium.org/p/client.v8/builders/V8%20Arm%20-%20debug/builds/549
https://build.chromium.org/p/client.v8/builders/V8%20Arm%20-%20debug/builds/550

Original issue's description:
> Sampling heap profiler data structure changes
>
> Previously, the sampling heap profiler stored a list of samples and then
> built a tree representation when the profile was queried by calling
> GetAllocationProfile. This change reduces duplication by removing stacks
> from all samples. Also, less information is stored in the tree
> maintained by the profiler and remaining information (script name, line
> no, etc) is resolved when a profile is requested.
>
> BUG=
>
> Committed: https://crrev.com/cdd55e2a3717723492d76f66810bf56b8de7f198
> Cr-Commit-Position: refs/heads/master@{#34119}

TBR=ofrobots@google.com,ulan@chromium.org,hpayer@chromium.org,mattloring@goog...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=

Committed: https://crrev.com/4578e52aefb8c4727742ce2e254613e482fdad1f
Cr-Commit-Position: refs/heads/master@{#34128}
==========

[commit-bot: I haz the power, 2016-02-18 19:05:45]

Patchset 1 (id:??) landed as
https://crrev.com/4578e52aefb8c4727742ce2e254613e482fdad1f
Cr-Commit-Position: refs/heads/master@{#34128}

[ofrobots, 2016-02-18 19:29:35]

On 2016/02/18 19:05:45, commit-bot: I haz the power wrote:
> Patchset 1 (id:??) landed as
> https://crrev.com/4578e52aefb8c4727742ce2e254613e482fdad1f
> Cr-Commit-Position: refs/heads/master@{#34128}

Hmm.. I don't see any obvious reason why this change could affect the CPU
profiler.

[Michael Achenbach, 2016-02-19 07:32:20]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1714493003/ by machenbach@chromium.org.

The reason for reverting is: Failure keeps lurking around after the revert. I'll
reland, sorry for the inconvenience!.