Reland of Thread maybe-assigned through the bytecodes.

Reland of Thread maybe-assigned through the bytecodes. (patchset #1 id:1 of https://codereview.chromium.org/2680923003/ )

Reason for revert:
False alarm, bot hiccup

Original issue's description:
> Revert of Thread maybe-assigned through the bytecodes. (patchset #5 id:80001 of https://codereview.chromium.org/2655733003/ )
> 
> Reason for revert:
> needed for properly reverting https://chromium.googlesource.com/v8/v8/+/f3ae5ccf57690d8c2d87c4fe1d10b103ad6a4ab3
> 
> Original issue's description:
> > Thread maybe-assigned through the bytecodes.
> > 
> > This introduces LoadImmutableContextSlot and LoadImmutableCurrentContextSlot
> > bytecodes, which are emitted when reading from never-assigned context slot.
> > 
> > There is a subtlety here: the slot are not immutable, the meaning is
> > actually undefined-or-hole-or-immutable.
> > 
> > Review-Url: https://codereview.chromium.org/2655733003
> > Cr-Commit-Position: refs/heads/master@{#43000}
> > Committed: https://chromium.googlesource.com/v8/v8/+/17c2dd388697da626224c371c8181d20d2016d82
> 
> TBR=rmcilroy@chromium.org,bmeurer@chromium.org,neis@chromium.org,jarin@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> 
> Review-Url: https://codereview.chromium.org/2680923003
> Cr-Commit-Position: refs/heads/master@{#43011}
> Committed: https://chromium.googlesource.com/v8/v8/+/ece4e54a31ac76ee9c450270d65270562db716e1

TBR=rmcilroy@chromium.org,bmeurer@chromium.org,neis@chromium.org,jarin@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2679953003
Cr-Commit-Position: refs/heads/master@{#43012}
Committed: https://chromium.googlesource.com/v8/v8/+/96e4f6145b0734daa3f2a9a2dce7e51ebbaab3c5

[Michael Hablich, 2017-02-07 20:41:44]

The CQ bit was checked by hablich@chromium.org

[Michael Hablich, 2017-02-07 20:41:47]

Created Reland of Thread maybe-assigned through the bytecodes.

[commit-bot: I haz the power, 2017-02-07 20:41:52]

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, 2017-02-07 20:42:04]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1486500104810170, "parent_rev":
"ece4e54a31ac76ee9c450270d65270562db716e1", "commit_rev":
"96e4f6145b0734daa3f2a9a2dce7e51ebbaab3c5"}

[commit-bot: I haz the power, 2017-02-07 20:42:09]

Description was changed from

==========
Reland of Thread maybe-assigned through the bytecodes. (patchset #1 id:1 of
https://codereview.chromium.org/2680923003/ )

Reason for revert:
False alarm, bot hiccup

Original issue's description:
> Revert of Thread maybe-assigned through the bytecodes. (patchset #5 id:80001
of https://codereview.chromium.org/2655733003/ )
> 
> Reason for revert:
> needed for properly reverting
https://chromium.googlesource.com/v8/v8/+/f3ae5ccf57690d8c2d87c4fe1d10b103ad6...
> 
> Original issue's description:
> > Thread maybe-assigned through the bytecodes.
> > 
> > This introduces LoadImmutableContextSlot and LoadImmutableCurrentContextSlot
> > bytecodes, which are emitted when reading from never-assigned context slot.
> > 
> > There is a subtlety here: the slot are not immutable, the meaning is
> > actually undefined-or-hole-or-immutable.
> > 
> > Review-Url: https://codereview.chromium.org/2655733003
> > Cr-Commit-Position: refs/heads/master@{#43000}
> > Committed:
https://chromium.googlesource.com/v8/v8/+/17c2dd388697da626224c371c8181d20d20...
> 
>
TBR=rmcilroy@chromium.org,bmeurer@chromium.org,neis@chromium.org,jarin@chromi...
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> 
> Review-Url: https://codereview.chromium.org/2680923003
> Cr-Commit-Position: refs/heads/master@{#43011}
> Committed:
https://chromium.googlesource.com/v8/v8/+/ece4e54a31ac76ee9c450270d65270562db...

TBR=rmcilroy@chromium.org,bmeurer@chromium.org,neis@chromium.org,jarin@chromi...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
==========

to

==========
Reland of Thread maybe-assigned through the bytecodes. (patchset #1 id:1 of
https://codereview.chromium.org/2680923003/ )

Reason for revert:
False alarm, bot hiccup

Original issue's description:
> Revert of Thread maybe-assigned through the bytecodes. (patchset #5 id:80001
of https://codereview.chromium.org/2655733003/ )
> 
> Reason for revert:
> needed for properly reverting
https://chromium.googlesource.com/v8/v8/+/f3ae5ccf57690d8c2d87c4fe1d10b103ad6...
> 
> Original issue's description:
> > Thread maybe-assigned through the bytecodes.
> > 
> > This introduces LoadImmutableContextSlot and LoadImmutableCurrentContextSlot
> > bytecodes, which are emitted when reading from never-assigned context slot.
> > 
> > There is a subtlety here: the slot are not immutable, the meaning is
> > actually undefined-or-hole-or-immutable.
> > 
> > Review-Url: https://codereview.chromium.org/2655733003
> > Cr-Commit-Position: refs/heads/master@{#43000}
> > Committed:
https://chromium.googlesource.com/v8/v8/+/17c2dd388697da626224c371c8181d20d20...
> 
>
TBR=rmcilroy@chromium.org,bmeurer@chromium.org,neis@chromium.org,jarin@chromi...
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> 
> Review-Url: https://codereview.chromium.org/2680923003
> Cr-Commit-Position: refs/heads/master@{#43011}
> Committed:
https://chromium.googlesource.com/v8/v8/+/ece4e54a31ac76ee9c450270d65270562db...

TBR=rmcilroy@chromium.org,bmeurer@chromium.org,neis@chromium.org,jarin@chromi...
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2679953003
Cr-Commit-Position: refs/heads/master@{#43012}
Committed:
https://chromium.googlesource.com/v8/v8/+/96e4f6145b0734daa3f2a9a2dce7e51ebba...
==========

[commit-bot: I haz the power, 2017-02-07 20:42:11]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/96e4f6145b0734daa3f2a9a2dce7e51ebba...