Revert of [heap] Take page lock when scavenging old to new references in Scavenger.

Revert of [heap] Take page lock when scavenging old to new references in Scavenger. (patchset #2 id:20001 of https://codereview.chromium.org/2781363002/ )

Reason for revert:
This results in a deadlock when the scavenger decides to perform sweeping and re-grabs the same mutex.

Original issue's description:
> [heap] Take page lock when scavenging old to new references in Scavenger.
> 
> BUG=v8:5807
> 
> Review-Url: https://codereview.chromium.org/2781363002
> Cr-Commit-Position: refs/heads/master@{#44268}
> Committed: https://chromium.googlesource.com/v8/v8/+/4024e6a1bb0b803a5cd16fcd11f39cc305b943c6

TBR=ulan@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5807
Review-Url: https://codereview.chromium.org/2786313003
Cr-Commit-Position: refs/heads/master@{#44302}
Committed: https://chromium.googlesource.com/v8/v8/+/d6bd3ebaea728d4c6694f22fc5334d1e1b2c1589

[Hannes Payer (out of office), 2017-03-31 10:45:38]

The CQ bit was checked by hpayer@chromium.org

[Hannes Payer (out of office), 2017-03-31 10:45:39]

Created Revert of [heap] Take page lock when scavenging old to new references in
Scavenger.

[commit-bot: I haz the power, 2017-03-31 10:45:51]

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, 2017-03-31 10:45:57]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1490957138866570, "parent_rev":
"a450c18544df40f7c7cbed206a7cdd1ed38853aa", "commit_rev":
"d6bd3ebaea728d4c6694f22fc5334d1e1b2c1589"}

[commit-bot: I haz the power, 2017-03-31 10:46:02]

Description was changed from

==========
Revert of [heap] Take page lock when scavenging old to new references in
Scavenger. (patchset #2 id:20001 of https://codereview.chromium.org/2781363002/
)

Reason for revert:
This results in a deadlock when the scavenger decides to perform sweeping and
re-grabs the same mutex.

Original issue's description:
> [heap] Take page lock when scavenging old to new references in Scavenger.
> 
> BUG=v8:5807
> 
> Review-Url: https://codereview.chromium.org/2781363002
> Cr-Commit-Position: refs/heads/master@{#44268}
> Committed:
https://chromium.googlesource.com/v8/v8/+/4024e6a1bb0b803a5cd16fcd11f39cc305b...

TBR=ulan@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5807
==========

to

==========
Revert of [heap] Take page lock when scavenging old to new references in
Scavenger. (patchset #2 id:20001 of https://codereview.chromium.org/2781363002/
)

Reason for revert:
This results in a deadlock when the scavenger decides to perform sweeping and
re-grabs the same mutex.

Original issue's description:
> [heap] Take page lock when scavenging old to new references in Scavenger.
> 
> BUG=v8:5807
> 
> Review-Url: https://codereview.chromium.org/2781363002
> Cr-Commit-Position: refs/heads/master@{#44268}
> Committed:
https://chromium.googlesource.com/v8/v8/+/4024e6a1bb0b803a5cd16fcd11f39cc305b...

TBR=ulan@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5807

Review-Url: https://codereview.chromium.org/2786313003
Cr-Commit-Position: refs/heads/master@{#44302}
Committed:
https://chromium.googlesource.com/v8/v8/+/d6bd3ebaea728d4c6694f22fc5334d1e1b2...
==========

[commit-bot: I haz the power, 2017-03-31 10:46:03]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/d6bd3ebaea728d4c6694f22fc5334d1e1b2...