Revert of [regexp] Remove IsRegExp intrinsic

Revert of [regexp] Remove IsRegExp intrinsic (patchset #1 id:1 of https://codereview.chromium.org/2591923003/ )

Reason for revert:
speculative revert: https://codereview.chromium.org/2596013002/

Original issue's description:
> [regexp] Remove IsRegExp intrinsic
> 
> The two remaining uses of this intrinsic in debug.js and mirrors.js now
> simply rely on the runtime function.
> 
> BUG=v8:5339
> 
> Review-Url: https://codereview.chromium.org/2591923003
> Cr-Commit-Position: refs/heads/master@{#41892}
> Committed: https://chromium.googlesource.com/v8/v8/+/c9cb94a06fa7a863d24dd6760b66cecd55748abf

TBR=bmeurer@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
Review-Url: https://codereview.chromium.org/2592383002
Cr-Commit-Position: refs/heads/master@{#41915}
Committed: https://chromium.googlesource.com/v8/v8/+/1e994192d6e5e441f6dc14596f25c7273651fba8

[Michael Hablich, 2016-12-22 09:39:15]

The CQ bit was checked by hablich@chromium.org

[Michael Hablich, 2016-12-22 09:39:16]

Created Revert of [regexp] Remove IsRegExp intrinsic

[commit-bot: I haz the power, 2016-12-22 09:39:25]

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, 2016-12-22 09:39:38]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1482399555919020, "parent_rev":
"21dfcf5dadba04c2f2c2146704ab6ea4952f4997", "commit_rev":
"1e994192d6e5e441f6dc14596f25c7273651fba8"}

[commit-bot: I haz the power, 2016-12-22 09:39:44]

Description was changed from

==========
Revert of [regexp] Remove IsRegExp intrinsic (patchset #1 id:1 of
https://codereview.chromium.org/2591923003/ )

Reason for revert:
speculative revert: https://codereview.chromium.org/2596013002/

Original issue's description:
> [regexp] Remove IsRegExp intrinsic
> 
> The two remaining uses of this intrinsic in debug.js and mirrors.js now
> simply rely on the runtime function.
> 
> BUG=v8:5339
> 
> Review-Url: https://codereview.chromium.org/2591923003
> Cr-Commit-Position: refs/heads/master@{#41892}
> Committed:
https://chromium.googlesource.com/v8/v8/+/c9cb94a06fa7a863d24dd6760b66cecd557...

TBR=bmeurer@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
==========

to

==========
Revert of [regexp] Remove IsRegExp intrinsic (patchset #1 id:1 of
https://codereview.chromium.org/2591923003/ )

Reason for revert:
speculative revert: https://codereview.chromium.org/2596013002/

Original issue's description:
> [regexp] Remove IsRegExp intrinsic
> 
> The two remaining uses of this intrinsic in debug.js and mirrors.js now
> simply rely on the runtime function.
> 
> BUG=v8:5339
> 
> Review-Url: https://codereview.chromium.org/2591923003
> Cr-Commit-Position: refs/heads/master@{#41892}
> Committed:
https://chromium.googlesource.com/v8/v8/+/c9cb94a06fa7a863d24dd6760b66cecd557...

TBR=bmeurer@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

Review-Url: https://codereview.chromium.org/2592383002
Cr-Commit-Position: refs/heads/master@{#41915}
Committed:
https://chromium.googlesource.com/v8/v8/+/1e994192d6e5e441f6dc14596f25c727365...
==========

[commit-bot: I haz the power, 2016-12-22 09:39:45]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/1e994192d6e5e441f6dc14596f25c727365...