[turbofan] Also constant-fold Object.getPrototypeOf if possible.

[turbofan] Also constant-fold Object.getPrototypeOf if possible.

We already have an optimization to constant-fold access to an object's
prototype via the special __proto__ accessor (specified in appendix B).
We can use the same optimization to also constant-fold accesses to an
object's prototype via the official Object.getPrototypeOf function.

Also add the optimization for Reflect.getPrototypeOf, which is
equivalent for object inputs.

This is commonly used by Babel to implement various new language
features, for example subclassing and certain property lookups.

R=yangguo@chromium.org
BUG=v8:6292
Review-Url: https://codereview.chromium.org/2841463002
Cr-Commit-Position: refs/heads/master@{#44788}
Committed: https://chromium.googlesource.com/v8/v8/+/359b5f93d4a0f5e07c2bed54e6f52abacec43285

[Benedikt Meurer, 2017-04-24 05:10:58]

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

[commit-bot: I haz the power, 2017-04-24 05:11:01]

Dry run: CQ is trying da patch.

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

[Benedikt Meurer, 2017-04-24 05:11:41]

Description was changed from

==========
[turbofan] Also constant-fold Object.getPrototypeOf if possible.

We already have an optimization to constant-fold access to an object's
prototype via the special __proto__ accessor (specified in appendix B).
We can use the same optimization to also constant-fold accesses to an
object's prototype via the official Object.getPrototypeOf function.

This is commonly used by Babel to implement various new language
features, for example subclassing and certain property lookups.

R=yangguo@chromium.org
BUG=v8:6292
==========

to

==========
[turbofan] Also constant-fold Object.getPrototypeOf if possible.

We already have an optimization to constant-fold access to an object's
prototype via the special __proto__ accessor (specified in appendix B).
We can use the same optimization to also constant-fold accesses to an
object's prototype via the official Object.getPrototypeOf function.

Also add the optimization for Reflect.getPrototypeOf, which is
equivalent for object inputs.

This is commonly used by Babel to implement various new language
features, for example subclassing and certain property lookups.

R=yangguo@chromium.org
BUG=v8:6292
==========

[Benedikt Meurer, 2017-04-24 05:13:12]

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

[commit-bot: I haz the power, 2017-04-24 05:13:21]

Dry run: CQ is trying da patch.

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

[Yang, 2017-04-24 05:14:12]

On 2017/04/24 05:10:57, Benedikt Meurer wrote:

lgtm.

[Benedikt Meurer, 2017-04-24 05:22:59]

The CQ bit was unchecked by bmeurer@chromium.org

[Benedikt Meurer, 2017-04-24 05:23:03]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2017-04-24 05:23:13]

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, 2017-04-24 05:37:49]

CQ is committing da patch.

Bot data: {"patchset_id": 20001, "attempt_start_ts": 1493011383222970,
"parent_rev": "e72ee1d327409bee8c9aad428f27bae3beb487af", "commit_rev":
"359b5f93d4a0f5e07c2bed54e6f52abacec43285"}

[commit-bot: I haz the power, 2017-04-24 05:37:57]

Description was changed from

==========
[turbofan] Also constant-fold Object.getPrototypeOf if possible.

We already have an optimization to constant-fold access to an object's
prototype via the special __proto__ accessor (specified in appendix B).
We can use the same optimization to also constant-fold accesses to an
object's prototype via the official Object.getPrototypeOf function.

Also add the optimization for Reflect.getPrototypeOf, which is
equivalent for object inputs.

This is commonly used by Babel to implement various new language
features, for example subclassing and certain property lookups.

R=yangguo@chromium.org
BUG=v8:6292
==========

to

==========
[turbofan] Also constant-fold Object.getPrototypeOf if possible.

We already have an optimization to constant-fold access to an object's
prototype via the special __proto__ accessor (specified in appendix B).
We can use the same optimization to also constant-fold accesses to an
object's prototype via the official Object.getPrototypeOf function.

Also add the optimization for Reflect.getPrototypeOf, which is
equivalent for object inputs.

This is commonly used by Babel to implement various new language
features, for example subclassing and certain property lookups.

R=yangguo@chromium.org
BUG=v8:6292

Review-Url: https://codereview.chromium.org/2841463002
Cr-Commit-Position: refs/heads/master@{#44788}
Committed:
https://chromium.googlesource.com/v8/v8/+/359b5f93d4a0f5e07c2bed54e6f52abacec...
==========

[commit-bot: I haz the power, 2017-04-24 05:38:00]

Committed patchset #2 (id:20001) as
https://chromium.googlesource.com/v8/v8/+/359b5f93d4a0f5e07c2bed54e6f52abacec...