[turbofan] Properly optimize immutable property loads.

[turbofan] Properly optimize immutable property loads.

When lowering a JSLoadNamed with an immutable own property of a
known constant JSObject, we can just constant fold the load during
native context specialization, similar to what Crankshaft does in
HOptimizedGraphBuilder::BuildLoadNamedField. This way we can also
constant-fold stuff like Math.LN2 and friends.

R=jarin@chromium.org
BUG=v8:5267
Committed: https://crrev.com/def77f4f420f7459d748ba487d739d74a78eb221
Cr-Commit-Position: refs/heads/master@{#39849}

[Benedikt Meurer, 2016-09-28 17:24:11]

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

[commit-bot: I haz the power, 2016-09-28 17:24:17]

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

[Benedikt Meurer, 2016-09-28 17:25:50]

Hey Jaro,

Here's an easy one I spotted in various Kraken benchmarks.
Please take a look.

Thanks,
Benedikt

[commit-bot: I haz the power, 2016-09-28 17:37:42]

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

[commit-bot: I haz the power, 2016-09-28 17:37:43]

Dry run: Try jobs failed on following builders:
  v8_linux64_gyp_rel_ng on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_gyp_rel_ng/build...)
  v8_linux64_gyp_rel_ng_triggered on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_gyp_rel_ng_trigg...)

[Benedikt Meurer, 2016-09-28 17:53:17]

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

[commit-bot: I haz the power, 2016-09-28 17:53:21]

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

[Benedikt Meurer, 2016-09-28 17:57:10]

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

[commit-bot: I haz the power, 2016-09-28 17:57:21]

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

[Benedikt Meurer, 2016-09-28 17:57:27]

Patchset #2 (id:20001) has been deleted

[commit-bot: I haz the power, 2016-09-28 18:30:30]

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

[commit-bot: I haz the power, 2016-09-28 18:30:31]

Dry run: This issue passed the CQ dry run.

[Franzi, 2016-09-29 06:43:02]

On 2016/09/28 at 17:25:50, bmeurer wrote:
> Hey Jaro,
> 
> Here's an easy one I spotted in various Kraken benchmarks.
> Please take a look.
> 
> Thanks,
> Benedikt

LGTM.

[Benedikt Meurer, 2016-09-29 06:54:36]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-09-29 06:54:37]

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, 2016-09-29 06:56:38]

Committed patchset #2 (id:40001)

[commit-bot: I haz the power, 2016-09-29 06:56:49]

Description was changed from

==========
[turbofan] Properly optimize immutable property loads.

When lowering a JSLoadNamed with an immutable own property of a
known constant JSObject, we can just constant fold the load during
native context specialization, similar to what Crankshaft does in
HOptimizedGraphBuilder::BuildLoadNamedField. This way we can also
constant-fold stuff like Math.LN2 and friends.

R=jarin@chromium.org
BUG=v8:5267
==========

to

==========
[turbofan] Properly optimize immutable property loads.

When lowering a JSLoadNamed with an immutable own property of a
known constant JSObject, we can just constant fold the load during
native context specialization, similar to what Crankshaft does in
HOptimizedGraphBuilder::BuildLoadNamedField. This way we can also
constant-fold stuff like Math.LN2 and friends.

R=jarin@chromium.org
BUG=v8:5267

Committed: https://crrev.com/def77f4f420f7459d748ba487d739d74a78eb221
Cr-Commit-Position: refs/heads/master@{#39849}
==========

[commit-bot: I haz the power, 2016-09-29 06:56:50]

Patchset 2 (id:??) landed as
https://crrev.com/def77f4f420f7459d748ba487d739d74a78eb221
Cr-Commit-Position: refs/heads/master@{#39849}