[regexp] Remove dead code

[regexp] Remove dead code

Remove dead code, and drop the legacy RegExp.prototype.exec implementation (the
only differences are TO_BOOLEAN on global and sticky).

BUG=v8:5339
Committed: https://crrev.com/1cb2a70cb5baa7545fdf9cc4e035a6d45cb189fd
Cr-Commit-Position: refs/heads/master@{#39121}

[jgruber, 2016-09-01 11:32:42]

The CQ bit was checked by jgruber@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-09-01 11:32:53]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[jgruber, 2016-09-01 11:34:30]

jgruber@chromium.org changed reviewers:
+ bmeurer@chromium.org

[Benedikt Meurer, 2016-09-01 11:39:36]

LGTM.

[commit-bot: I haz the power, 2016-09-01 11:59:03]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-09-01 11:59:04]

Dry run: This issue passed the CQ dry run.

[jgruber, 2016-09-02 08:34:57]

The CQ bit was checked by jgruber@chromium.org

[commit-bot: I haz the power, 2016-09-02 08:35:07]

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, 2016-09-02 08:37:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-02 08:37:29]

Description was changed from

==========
[regexp] Remove dead code

Remove dead code, and drop the legacy RegExp.prototype.exec implementation (the
only differences are TO_BOOLEAN on global and sticky).

BUG=v8:5339
==========

to

==========
[regexp] Remove dead code

Remove dead code, and drop the legacy RegExp.prototype.exec implementation (the
only differences are TO_BOOLEAN on global and sticky).

BUG=v8:5339

Committed: https://crrev.com/1cb2a70cb5baa7545fdf9cc4e035a6d45cb189fd
Cr-Commit-Position: refs/heads/master@{#39121}
==========

[commit-bot: I haz the power, 2016-09-02 08:37:29]

Patchset 1 (id:??) landed as
https://crrev.com/1cb2a70cb5baa7545fdf9cc4e035a6d45cb189fd
Cr-Commit-Position: refs/heads/master@{#39121}

[jgruber, 2016-09-05 11:55:31]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2310903002/ by jgruber@chromium.org.

The reason for reverting is: Performance regressions: crbug.com/644087
Clusterfuzz: crbug.com/644074

We'll reland all regexp changes at once when the port is complete and at least
performance-neutral, since the partial port requires slow workarounds..