Revert of [regexp] Use consistent map checks for fast paths

Revert of [regexp] Use consistent map checks for fast paths (patchset #7 id:120001 of https://chromiumcodereview.appspot.com/2434983002/ )

Reason for revert:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/builds/10853

Original issue's description:
> [regexp] Use consistent map checks for fast paths
>
> These map checks were implemented for TF code already. This CL makes
> sure that parts implemented in C++ follow the same logic, which is:
>
> An object is an unmodified regexp if:
> 1) it's a receiver,
> 2) its map is the initial regexp map,
> 3) its prototype is a receiver,
> 4) and its prototype's map is the initial prototype's initial map.
>
> We can now be smarter in @@replace and @@split since checking maps
> (unlike the previous check of RegExp.prototype.exec) is not observable,
> so we can perform fast-path checks at a time of our choosing.
>
> BUG=v8:5339, v8:5434, v8:5123
TBR=yangguo@chromium.org,jgruber@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5339, v8:5434, v8:5123
Committed: https://crrev.com/0b7e35ff16df021d458c85d0019ca4858d9fe487
Cr-Commit-Position: refs/heads/master@{#40499}

[Michael Achenbach, 2016-10-21 11:14:43]

The CQ bit was checked by machenbach@chromium.org

[Michael Achenbach, 2016-10-21 11:14:43]

Created Revert of [regexp] Use consistent map checks for fast paths

[commit-bot: I haz the power, 2016-10-21 11:14:54]

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, 2016-10-21 11:15:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-17 22:09:34]

Description was changed from

==========
Revert of [regexp] Use consistent map checks for fast paths (patchset #7
id:120001 of https://chromiumcodereview.appspot.com/2434983002/ )

Reason for revert:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/bui...

Original issue's description:
> [regexp] Use consistent map checks for fast paths
> 
> These map checks were implemented for TF code already. This CL makes
> sure that parts implemented in C++ follow the same logic, which is:
> 
> An object is an unmodified regexp if:
> 1) it's a receiver,
> 2) its map is the initial regexp map,
> 3) its prototype is a receiver,
> 4) and its prototype's map is the initial prototype's initial map.
> 
> We can now be smarter in @@replace and @@split since checking maps
> (unlike the previous check of RegExp.prototype.exec) is not observable, 
> so we can perform fast-path checks at a time of our choosing.
> 
> BUG=v8:5339,v8:5434,v8:5123

TBR=yangguo@chromium.org,jgruber@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5339,v8:5434,v8:5123
==========

to

==========
Revert of [regexp] Use consistent map checks for fast paths (patchset #7
id:120001 of https://chromiumcodereview.appspot.com/2434983002/ )

Reason for revert:
https://build.chromium.org/p/client.v8.fyi/builders/V8-Blink%20Linux%2064/bui...

Original issue's description:
> [regexp] Use consistent map checks for fast paths
>
> These map checks were implemented for TF code already. This CL makes
> sure that parts implemented in C++ follow the same logic, which is:
>
> An object is an unmodified regexp if:
> 1) it's a receiver,
> 2) its map is the initial regexp map,
> 3) its prototype is a receiver,
> 4) and its prototype's map is the initial prototype's initial map.
>
> We can now be smarter in @@replace and @@split since checking maps
> (unlike the previous check of RegExp.prototype.exec) is not observable,
> so we can perform fast-path checks at a time of our choosing.
>
> BUG=v8:5339,v8:5434,v8:5123

TBR=yangguo@chromium.org,jgruber@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5339,v8:5434,v8:5123

Committed: https://crrev.com/0b7e35ff16df021d458c85d0019ca4858d9fe487
Cr-Commit-Position: refs/heads/master@{#40499}
==========

[commit-bot: I haz the power, 2016-11-17 22:09:35]

Patchset 1 (id:??) landed as
https://crrev.com/0b7e35ff16df021d458c85d0019ca4858d9fe487
Cr-Commit-Position: refs/heads/master@{#40499}