Fix FastAssign for self-assignment

Fix FastAssign for self-assignment

Storing a data property on |target| can change |source|'s map
if |target| and |source| are the same object.

BUG=chromium:716520
Review-Url: https://codereview.chromium.org/2855133006
Cr-Commit-Position: refs/heads/master@{#45097}
Committed: https://chromium.googlesource.com/v8/v8/+/1f51f66f738a05b5f0181e7e37ab171b6f112bac

[Jakob Kummerow, 2017-05-04 12:54:45]

jkummerow@chromium.org changed reviewers:
+ cbruni@chromium.org

[Jakob Kummerow, 2017-05-04 12:54:46]

Camillo: PTAL.

Sathya: FYI.

[Jakob Kummerow, 2017-05-04 12:55:36]

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

[commit-bot: I haz the power, 2017-05-04 12:55:44]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Camillo Bruni, 2017-05-04 13:01:46]

lgtm

[commit-bot: I haz the power, 2017-05-04 13:26:15]

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

[commit-bot: I haz the power, 2017-05-04 13:26:16]

Dry run: This issue passed the CQ dry run.

[Jakob Kummerow, 2017-05-04 13:39:24]

The CQ bit was checked by jkummerow@chromium.org

[commit-bot: I haz the power, 2017-05-04 13:39:33]

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, 2017-05-04 13:41:09]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493905164466940, "parent_rev":
"6548f76c922ad108f031c93c50bda40fb5211e43", "commit_rev":
"1f51f66f738a05b5f0181e7e37ab171b6f112bac"}

[commit-bot: I haz the power, 2017-05-04 13:41:15]

Description was changed from

==========
Fix FastAssign for self-assignment

Storing a data property on |target| can change |source|'s map
if |target| and |source| are the same object.

BUG=chromium:716520
==========

to

==========
Fix FastAssign for self-assignment

Storing a data property on |target| can change |source|'s map
if |target| and |source| are the same object.

BUG=chromium:716520

Review-Url: https://codereview.chromium.org/2855133006
Cr-Commit-Position: refs/heads/master@{#45097}
Committed:
https://chromium.googlesource.com/v8/v8/+/1f51f66f738a05b5f0181e7e37ab171b6f1...
==========

[commit-bot: I haz the power, 2017-05-04 13:41:16]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/1f51f66f738a05b5f0181e7e37ab171b6f1...