Revert of Internalize strings in-place

Revert of Internalize strings in-place (patchset #17 id:320001 of https://codereview.chromium.org/2549773002/ )

Reason for revert:
blocks roll, see: https://codereview.chromium.org/2628733002/

Debug mode runs into an Abort("External string expected, but not found").

Original issue's description:
> Internalize strings in-place (reland)
> 
> using newly introduced ThinStrings, which store a pointer to the actual,
> internalized string they represent.
> 
> BUG=v8:4520
> 
> (Previously landed as #42168 / af51befe694f.
> 
> Review-Url: https://codereview.chromium.org/2549773002
> Cr-Commit-Position: refs/heads/master@{#42193}
> Committed: https://chromium.googlesource.com/v8/v8/+/4c699e349a4986b28574b3a51e8780e3a3d067b1

TBR=ishell@chromium.org,hpayer@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4520
Review-Url: https://codereview.chromium.org/2625073002
Cr-Commit-Position: refs/heads/master@{#42212}
Committed: https://chromium.googlesource.com/v8/v8/+/7ef86f809131b169223b0cfe4a2b93792142da4a

[Jakob Kummerow, 2017-01-11 09:59:29]

The CQ bit was checked by jkummerow@chromium.org

[Jakob Kummerow, 2017-01-11 09:59:30]

Created Revert of Internalize strings in-place

[commit-bot: I haz the power, 2017-01-11 09:59:38]

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, 2017-01-11 09:59:54]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484128769685850, "parent_rev":
"e2935640d76a5ed00378ee90ce2d9d6756812341", "commit_rev":
"7ef86f809131b169223b0cfe4a2b93792142da4a"}

[commit-bot: I haz the power, 2017-01-11 10:00:01]

Description was changed from

==========
Revert of Internalize strings in-place (patchset #17 id:320001 of
https://codereview.chromium.org/2549773002/ )

Reason for revert:
blocks roll, see: https://codereview.chromium.org/2628733002/

Debug mode runs into an Abort("External string expected, but not found").

Original issue's description:
> Internalize strings in-place (reland)
> 
> using newly introduced ThinStrings, which store a pointer to the actual,
> internalized string they represent.
> 
> BUG=v8:4520
> 
> (Previously landed as #42168 / af51befe694f.
> 
> Review-Url: https://codereview.chromium.org/2549773002
> Cr-Commit-Position: refs/heads/master@{#42193}
> Committed:
https://chromium.googlesource.com/v8/v8/+/4c699e349a4986b28574b3a51e8780e3a3d...

TBR=ishell@chromium.org,hpayer@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4520
==========

to

==========
Revert of Internalize strings in-place (patchset #17 id:320001 of
https://codereview.chromium.org/2549773002/ )

Reason for revert:
blocks roll, see: https://codereview.chromium.org/2628733002/

Debug mode runs into an Abort("External string expected, but not found").

Original issue's description:
> Internalize strings in-place (reland)
> 
> using newly introduced ThinStrings, which store a pointer to the actual,
> internalized string they represent.
> 
> BUG=v8:4520
> 
> (Previously landed as #42168 / af51befe694f.
> 
> Review-Url: https://codereview.chromium.org/2549773002
> Cr-Commit-Position: refs/heads/master@{#42193}
> Committed:
https://chromium.googlesource.com/v8/v8/+/4c699e349a4986b28574b3a51e8780e3a3d...

TBR=ishell@chromium.org,hpayer@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:4520

Review-Url: https://codereview.chromium.org/2625073002
Cr-Commit-Position: refs/heads/master@{#42212}
Committed:
https://chromium.googlesource.com/v8/v8/+/7ef86f809131b169223b0cfe4a2b9379214...
==========

[commit-bot: I haz the power, 2017-01-11 10:00:02]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/7ef86f809131b169223b0cfe4a2b9379214...