[parser] fix null-dereference in DoExpression rewriting

[parser] fix null-dereference in DoExpression rewriting

BUG=v8:4661, v8:4488
LOG=N
R=adamk@chromium.org, rossberg@chromium.org, jkummerow@chromium.org

Committed: https://crrev.com/d3fe473b92d924e5d6bf6231d7244a1017e08725
Cr-Commit-Position: refs/heads/master@{#33250}

[caitp (gmail), 2016-01-12 18:16:45]

Description was changed from

==========
[parser] fix null-dereference in DoExpression rewriting

BUG=v8:4661
LOG=N
R=adamk@chromium.org, rossberg@chromium.org, jkummerow@chromium.org
==========

to

==========
[parser] fix null-dereference in DoExpression rewriting

BUG=v8:4661, v8:4488
LOG=N
R=adamk@chromium.org, rossberg@chromium.org, jkummerow@chromium.org
==========

[caitp (gmail), 2016-01-12 18:17:11]

Hi, PTAL

This fixes the crash reported by anba

[caitp (gmail), 2016-01-12 18:39:48]

On 2016/01/12 18:17:11, caitp wrote:
> Hi, PTAL
> 
> This fixes the crash reported by anba

I'm unable to reproduce the (new?) ignition failure locally :\

[caitp (gmail), 2016-01-12 18:49:25]

On 2016/01/12 18:39:48, caitp wrote:
> On 2016/01/12 18:17:11, caitp wrote:
> > Hi, PTAL
> > 
> > This fixes the crash reported by anba
> 
> I'm unable to reproduce the (new?) ignition failure locally :\

oh good, looks like that isn't my failure :>

[adamk, 2016-01-12 19:28:08]

lgtm

[caitp (gmail), 2016-01-12 19:29:53]

The CQ bit was checked by caitpotter88@gmail.com

[commit-bot: I haz the power, 2016-01-12 19:29:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1575133003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1575133003/1

[commit-bot: I haz the power, 2016-01-12 19:53:39]

Description was changed from

==========
[parser] fix null-dereference in DoExpression rewriting

BUG=v8:4661, v8:4488
LOG=N
R=adamk@chromium.org, rossberg@chromium.org, jkummerow@chromium.org
==========

to

==========
[parser] fix null-dereference in DoExpression rewriting

BUG=v8:4661, v8:4488
LOG=N
R=adamk@chromium.org, rossberg@chromium.org, jkummerow@chromium.org
==========

[commit-bot: I haz the power, 2016-01-12 19:53:39]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-12 19:54:20]

Description was changed from

==========
[parser] fix null-dereference in DoExpression rewriting

BUG=v8:4661, v8:4488
LOG=N
R=adamk@chromium.org, rossberg@chromium.org, jkummerow@chromium.org
==========

to

==========
[parser] fix null-dereference in DoExpression rewriting

BUG=v8:4661, v8:4488
LOG=N
R=adamk@chromium.org, rossberg@chromium.org, jkummerow@chromium.org

Committed: https://crrev.com/d3fe473b92d924e5d6bf6231d7244a1017e08725
Cr-Commit-Position: refs/heads/master@{#33250}
==========

[commit-bot: I haz the power, 2016-01-12 19:54:21]

Patchset 1 (id:??) landed as
https://crrev.com/d3fe473b92d924e5d6bf6231d7244a1017e08725
Cr-Commit-Position: refs/heads/master@{#33250}