Store correct String.prototype map on the context

Store correct String.prototype map on the context

The String.prototype was altered after snapshot time (during
experimental natives setup), invalidating the stored map used for
fast-path checks.

BUG=

Review-Url: https://codereview.chromium.org/2663303003
Cr-Commit-Position: refs/heads/master@{#42842}
Committed: https://chromium.googlesource.com/v8/v8/+/c67dc7e2431314542a6c24f948bdc043027365d3

[jgruber, 2017-02-01 08:57:43]

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

[commit-bot: I haz the power, 2017-02-01 08:57:52]

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

[jgruber, 2017-02-01 09:19:22]

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

[jgruber, 2017-02-01 09:19:23]

This fixes the String.prototype map we keep on the native context. Two
experimental natives (which run after snapshot time) modify String.prototype,
and recently some of these have been turned on by default.

[Benedikt Meurer, 2017-02-01 09:22:06]

lgtm

[commit-bot: I haz the power, 2017-02-01 09:26:55]

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

[commit-bot: I haz the power, 2017-02-01 09:26:56]

Dry run: This issue passed the CQ dry run.

[jgruber, 2017-02-01 09:28:09]

The CQ bit was checked by jgruber@chromium.org

[commit-bot: I haz the power, 2017-02-01 09:28:16]

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, 2017-02-01 09:29:51]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1485941289411170, "parent_rev":
"ad9dfc09113f5bd23c49c4968abcc1678d17b1de", "commit_rev":
"c67dc7e2431314542a6c24f948bdc043027365d3"}

[commit-bot: I haz the power, 2017-02-01 09:30:01]

Description was changed from

==========
Store correct String.prototype map on the context

The String.prototype was altered after snapshot time (during
experimental natives setup), invalidating the stored map used for
fast-path checks.

BUG=
==========

to

==========
Store correct String.prototype map on the context

The String.prototype was altered after snapshot time (during
experimental natives setup), invalidating the stored map used for
fast-path checks.

BUG=

Review-Url: https://codereview.chromium.org/2663303003
Cr-Commit-Position: refs/heads/master@{#42842}
Committed:
https://chromium.googlesource.com/v8/v8/+/c67dc7e2431314542a6c24f948bdc043027...
==========

[commit-bot: I haz the power, 2017-02-01 09:30:03]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/c67dc7e2431314542a6c24f948bdc043027...