[turbofan] Check for nullptr maps.

[turbofan] Check for nullptr maps.

ReduceJSStoreDataPropertyInLiteral should not reduce the monomorphic
case if the map got deleted. This has been fixed before in the context
of a larger commit, which was reverted.

R=adamk@chromium.org, mvstanton@chromium.org, bmeurer@chromium.org

BUG=v8:5873
Review-Url: https://codereview.chromium.org/2644733007
Cr-Commit-Position: refs/heads/master@{#42548}
Committed: https://chromium.googlesource.com/v8/v8/+/dd8881a5c406496427e4ba794b651af8ed3de213

[Franzi, 2017-01-20 09:28:55]

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

[commit-bot: I haz the power, 2017-01-20 09:28:59]

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

[Franzi, 2017-01-20 09:31:02]

Fix for the bug found with gcstress testing. Mike had fixed that before as part
of a larger CL, which got reverted.  PTAL. 

Thanks, 

Franzi

[Benedikt Meurer, 2017-01-20 09:43:31]

lgtm

[commit-bot: I haz the power, 2017-01-20 10:02:56]

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

[commit-bot: I haz the power, 2017-01-20 10:02:57]

Dry run: This issue passed the CQ dry run.

[Franzi, 2017-01-20 10:13:27]

The CQ bit was checked by franzih@chromium.org

[commit-bot: I haz the power, 2017-01-20 10:13:38]

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, 2017-01-20 10:50:17]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484907207405660, "parent_rev":
"73281702c8ae1fe22c2c718bc0f5dd4af66abfb4", "commit_rev":
"dd8881a5c406496427e4ba794b651af8ed3de213"}

[commit-bot: I haz the power, 2017-01-20 10:50:21]

Description was changed from

==========
[turbofan] Check for nullptr maps.

ReduceJSStoreDataPropertyInLiteral should not reduce the monomorphic
case if the map got deleted. This has been fixed before in the context
of a larger commit, which was reverted.

R=adamk@chromium.org, mvstanton@chromium.org, bmeurer@chromium.org

BUG=v8:5873
==========

to

==========
[turbofan] Check for nullptr maps.

ReduceJSStoreDataPropertyInLiteral should not reduce the monomorphic
case if the map got deleted. This has been fixed before in the context
of a larger commit, which was reverted.

R=adamk@chromium.org, mvstanton@chromium.org, bmeurer@chromium.org

BUG=v8:5873

Review-Url: https://codereview.chromium.org/2644733007
Cr-Commit-Position: refs/heads/master@{#42548}
Committed:
https://chromium.googlesource.com/v8/v8/+/dd8881a5c406496427e4ba794b651af8ed3...
==========

[commit-bot: I haz the power, 2017-01-20 10:50:22]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/dd8881a5c406496427e4ba794b651af8ed3...