[regexp] Simplify GetCapture

[regexp] Simplify GetCapture

GetCapture can reuse the bool pointer argument of GenericCaptureGetter
instead of duplicating that logic with additional checks.

The check also incorrectly checks for undefined while
GenericCaptureGetter returns the empty string on failure.

BUG=v8:5339
Committed: https://crrev.com/b182ab83029d0c225fbe33844089e0824d918bec
Cr-Commit-Position: refs/heads/master@{#40309}

[jgruber, 2016-10-14 08:13:14]

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

[commit-bot: I haz the power, 2016-10-14 08:13:18]

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

[jgruber, 2016-10-14 08:39:13]

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

[commit-bot: I haz the power, 2016-10-14 08:43:34]

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

[commit-bot: I haz the power, 2016-10-14 08:43:35]

Dry run: This issue passed the CQ dry run.

[Yang, 2016-10-14 11:35:23]

lgtm

[Yang, 2016-10-14 11:35:24]

lgtm

lgtm

[jgruber, 2016-10-14 11:45:19]

The CQ bit was checked by jgruber@chromium.org

[commit-bot: I haz the power, 2016-10-14 11:45:26]

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, 2016-10-14 11:47:58]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-14 11:48:18]

Description was changed from

==========
[regexp] Simplify GetCapture

GetCapture can reuse the bool pointer argument of GenericCaptureGetter
instead of duplicating that logic with additional checks.

The check also incorrectly checks for undefined while
GenericCaptureGetter returns the empty string on failure.

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

to

==========
[regexp] Simplify GetCapture

GetCapture can reuse the bool pointer argument of GenericCaptureGetter
instead of duplicating that logic with additional checks.

The check also incorrectly checks for undefined while
GenericCaptureGetter returns the empty string on failure.

BUG=v8:5339

Committed: https://crrev.com/b182ab83029d0c225fbe33844089e0824d918bec
Cr-Commit-Position: refs/heads/master@{#40309}
==========

[commit-bot: I haz the power, 2016-10-14 11:48:19]

Patchset 1 (id:??) landed as
https://crrev.com/b182ab83029d0c225fbe33844089e0824d918bec
Cr-Commit-Position: refs/heads/master@{#40309}