Revert of [crankshaft] Protect against deopt loops from string length overflows.

Revert of [crankshaft] Protect against deopt loops from string length overflows. (patchset #1 id:1 of https://codereview.chromium.org/2348293002/ )

Reason for revert:
Mean https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20arm64%20-%20sim%20-%20MSAN/builds/10910

Original issue's description:
> [crankshaft] Protect against deopt loops from string length overflows.
>
> Crankshaft just unconditionally deoptimizes the code when the length of
> a string addition result would overflow. In order to protect against
> deopt loops we insert a global protector cell.
>
> We will use the same mechanism for inlining certain string additions
> into TurboFan as well, and protecting against overflow (we will also
> extend this to deal with String.prototype.concat and friends once we
> get there).
>
> BUG=v8:5404
> R=jarin@chromium.org,hpayer@chromium.org
>
> Committed: https://crrev.com/cb19257a926a55209a6d6858ce26d51a0447ba71
> Cr-Commit-Position: refs/heads/master@{#39511}

TBR=hpayer@chromium.org,jarin@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5404
Committed: https://crrev.com/53510f6a800460a8f9e6432e8bcff400ad895926
Cr-Commit-Position: refs/heads/master@{#39518}

[Michael Achenbach, 2016-09-19 21:49:29]

The CQ bit was checked by machenbach@chromium.org

[Michael Achenbach, 2016-09-19 21:49:30]

Created Revert of [crankshaft] Protect against deopt loops from string length
overflows.

[commit-bot: I haz the power, 2016-09-19 21:49:37]

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, 2016-09-19 21:49:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-19 21:50:24]

Description was changed from

==========
Revert of [crankshaft] Protect against deopt loops from string length overflows.
(patchset #1 id:1 of https://codereview.chromium.org/2348293002/ )

Reason for revert:
Mean
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20arm64%20-%20...

Original issue's description:
> [crankshaft] Protect against deopt loops from string length overflows.
> 
> Crankshaft just unconditionally deoptimizes the code when the length of
> a string addition result would overflow. In order to protect against
> deopt loops we insert a global protector cell.
> 
> We will use the same mechanism for inlining certain string additions
> into TurboFan as well, and protecting against overflow (we will also
> extend this to deal with String.prototype.concat and friends once we
> get there).
> 
> BUG=v8:5404
> R=jarin@chromium.org,hpayer@chromium.org
> 
> Committed: https://crrev.com/cb19257a926a55209a6d6858ce26d51a0447ba71
> Cr-Commit-Position: refs/heads/master@{#39511}

TBR=hpayer@chromium.org,jarin@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5404
==========

to

==========
Revert of [crankshaft] Protect against deopt loops from string length overflows.
(patchset #1 id:1 of https://codereview.chromium.org/2348293002/ )

Reason for revert:
Mean
https://build.chromium.org/p/client.v8/builders/V8%20Linux%20-%20arm64%20-%20...

Original issue's description:
> [crankshaft] Protect against deopt loops from string length overflows.
>
> Crankshaft just unconditionally deoptimizes the code when the length of
> a string addition result would overflow. In order to protect against
> deopt loops we insert a global protector cell.
>
> We will use the same mechanism for inlining certain string additions
> into TurboFan as well, and protecting against overflow (we will also
> extend this to deal with String.prototype.concat and friends once we
> get there).
>
> BUG=v8:5404
> R=jarin@chromium.org,hpayer@chromium.org
>
> Committed: https://crrev.com/cb19257a926a55209a6d6858ce26d51a0447ba71
> Cr-Commit-Position: refs/heads/master@{#39511}

TBR=hpayer@chromium.org,jarin@chromium.org,bmeurer@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5404

Committed: https://crrev.com/53510f6a800460a8f9e6432e8bcff400ad895926
Cr-Commit-Position: refs/heads/master@{#39518}
==========

[commit-bot: I haz the power, 2016-09-19 21:50:25]

Patchset 1 (id:??) landed as
https://crrev.com/53510f6a800460a8f9e6432e8bcff400ad895926
Cr-Commit-Position: refs/heads/master@{#39518}