[turbofan] Constant-fold JSGetSuperConstructor.

[turbofan] Constant-fold JSGetSuperConstructor.

This adds support to constant-fold JSGetSuperConstructor(constructor)
for constructors with stable maps, i.e. where we can add a stability
dependency on the constructors map to get notified when the [[Prototype]]
of constructor changes.

R=petermarshall@chromium.org
BUG=v8:5517
Review-Url: https://codereview.chromium.org/2652763010
Cr-Commit-Position: refs/heads/master@{#42647}
Committed: https://chromium.googlesource.com/v8/v8/+/d0a24e913f6653531786bc237793fdb0e7ebfa53

[Benedikt Meurer, 2017-01-25 06:42:00]

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

[commit-bot: I haz the power, 2017-01-25 06:42:07]

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

[Benedikt Meurer, 2017-01-25 06:45:23]

Hey Peter,

Here's a simple optimization for the common case of GetSuperConstructor in
subclasses. We might need to extend this later, but for now it seems to get the
job done. Further optimizations now blocking on the super spread call. :-)
Please take a look.

Thanks,
Benedikt

[commit-bot: I haz the power, 2017-01-25 07:13:54]

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

[commit-bot: I haz the power, 2017-01-25 07:13:55]

Dry run: This issue passed the CQ dry run.

[petermarshall, 2017-01-25 08:32:41]

LGTM! You might need owners approval from someone else though, not sure.

[Benedikt Meurer, 2017-01-25 08:46:27]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2017-01-25 08:46:33]

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, 2017-01-25 08:48:50]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1485333987751920, "parent_rev":
"4ec372801e2e4c26659d046ecae8f2661b303487", "commit_rev":
"d0a24e913f6653531786bc237793fdb0e7ebfa53"}

[commit-bot: I haz the power, 2017-01-25 08:48:53]

Description was changed from

==========
[turbofan] Constant-fold JSGetSuperConstructor.

This adds support to constant-fold JSGetSuperConstructor(constructor)
for constructors with stable maps, i.e. where we can add a stability
dependency on the constructors map to get notified when the [[Prototype]]
of constructor changes.

R=petermarshall@chromium.org
BUG=v8:5517
==========

to

==========
[turbofan] Constant-fold JSGetSuperConstructor.

This adds support to constant-fold JSGetSuperConstructor(constructor)
for constructors with stable maps, i.e. where we can add a stability
dependency on the constructors map to get notified when the [[Prototype]]
of constructor changes.

R=petermarshall@chromium.org
BUG=v8:5517

Review-Url: https://codereview.chromium.org/2652763010
Cr-Commit-Position: refs/heads/master@{#42647}
Committed:
https://chromium.googlesource.com/v8/v8/+/d0a24e913f6653531786bc237793fdb0e7e...
==========

[commit-bot: I haz the power, 2017-01-25 08:48:54]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/d0a24e913f6653531786bc237793fdb0e7e...