[turbofan] Introduce a TransitionElementsKind simplified operator.

[turbofan] Introduce a TransitionElementsKind simplified operator.

Instead of wriring the elements kind transitions into the control flow
early on, we do instead put this marker into the effect chain, so that
the elements transitions are visible to the LoadElimination and can
thus be optimized properly there.

This CL itself doesn't add any of those optimizations, but just adds
the foundations to make them possible later.

R=jarin@chromium.org
BUG=v8:4930, v8:5141
Committed: https://crrev.com/908cd09f3a181628d1e76b96995e424f0bb18201
Cr-Commit-Position: refs/heads/master@{#37869}

[Benedikt Meurer, 2016-07-19 11:13:02]

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

[commit-bot: I haz the power, 2016-07-19 11:13:08]

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

[Benedikt Meurer, 2016-07-19 11:13:47]

Hey Jaro,

Here's the first step to finally optimize away the elements transitions.
Please take a look.

Thanks,
Benedikt

[Jarin, 2016-07-19 11:26:21]

lgtm, thanks!

[Benedikt Meurer, 2016-07-19 11:26:32]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-07-19 11:26:40]

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, 2016-07-19 11:42:56]

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

[commit-bot: I haz the power, 2016-07-19 11:42:59]

Try jobs failed on following builders:
  v8_mac_rel_ng on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel_ng/builds/5259)
  v8_mac_rel_ng_triggered on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_mac_rel_ng_triggered/bui...)

[Benedikt Meurer, 2016-07-19 13:06:28]

The CQ bit was checked by bmeurer@chromium.org

[Benedikt Meurer, 2016-07-19 13:06:29]

The patchset sent to the CQ was uploaded after l-g-t-m from jarin@chromium.org
Link to the patchset: https://codereview.chromium.org/2164573003/#ps40001
(title: "Fix the runtime fallback.")

[commit-bot: I haz the power, 2016-07-19 13:06:36]

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, 2016-07-19 13:38:19]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-07-19 13:41:13]

Description was changed from

==========
[turbofan] Introduce a TransitionElementsKind simplified operator.

Instead of wriring the elements kind transitions into the control flow
early on, we do instead put this marker into the effect chain, so that
the elements transitions are visible to the LoadElimination and can
thus be optimized properly there.

This CL itself doesn't add any of those optimizations, but just adds
the foundations to make them possible later.

R=jarin@chromium.org
BUG=v8:4930,v8:5141
==========

to

==========
[turbofan] Introduce a TransitionElementsKind simplified operator.

Instead of wriring the elements kind transitions into the control flow
early on, we do instead put this marker into the effect chain, so that
the elements transitions are visible to the LoadElimination and can
thus be optimized properly there.

This CL itself doesn't add any of those optimizations, but just adds
the foundations to make them possible later.

R=jarin@chromium.org
BUG=v8:4930,v8:5141

Committed: https://crrev.com/908cd09f3a181628d1e76b96995e424f0bb18201
Cr-Commit-Position: refs/heads/master@{#37869}
==========

[commit-bot: I haz the power, 2016-07-19 13:41:14]

Patchset 3 (id:??) landed as
https://crrev.com/908cd09f3a181628d1e76b96995e424f0bb18201
Cr-Commit-Position: refs/heads/master@{#37869}