[turbofan] Improve handling of TransitionElementsKind in load elimination.

[turbofan] Improve handling of TransitionElementsKind in load elimination.

We do not have to invalidate the abstract state if we are transitioning to
the object's map.

Committed: https://crrev.com/1929f80a3a3ff0bfa8cdb97f2aa6f444071ba3e4
Cr-Commit-Position: refs/heads/master@{#41053}

[Jarin, 2016-11-16 19:59:13]

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

[commit-bot: I haz the power, 2016-11-16 19:59:15]

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

[Jarin, 2016-11-16 20:21:04]

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

[Jarin, 2016-11-16 20:21:05]

Could you take a look, please?

This fixes up Octane crypto's hot loop.

[Benedikt Meurer, 2016-11-16 20:22:20]

LGTM with nit. Thanks!

https://codereview.chromium.org/2510843002/diff/1/src/compiler/load-eliminati...
File src/compiler/load-elimination.cc (right):

https://codereview.chromium.org/2510843002/diff/1/src/compiler/load-eliminati...
src/compiler/load-elimination.cc:872: if (target_map == object_map) {
Nit: Please do 

if (target_map != object_map) {
  ... kill
}
break;

instead

[Jarin, 2016-11-16 20:28:04]

The CQ bit was checked by jarin@chromium.org

[Jarin, 2016-11-16 20:28:05]

The patchset sent to the CQ was uploaded after l-g-t-m from bmeurer@chromium.org
Link to the patchset: https://codereview.chromium.org/2510843002/#ps20001
(title: "Address reviewer's comment")

[commit-bot: I haz the power, 2016-11-16 20:28:13]

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, 2016-11-16 20:56:08]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-11-17 22:37:07]

Description was changed from

==========
[turbofan] Improve handling of TransitionElementsKind in load elimination.

We do not have to invalidate the abstract state if we are transitioning to
the object's map.
==========

to

==========
[turbofan] Improve handling of TransitionElementsKind in load elimination.

We do not have to invalidate the abstract state if we are transitioning to
the object's map.

Committed: https://crrev.com/1929f80a3a3ff0bfa8cdb97f2aa6f444071ba3e4
Cr-Commit-Position: refs/heads/master@{#41053}
==========

[commit-bot: I haz the power, 2016-11-17 22:37:08]

Patchset 2 (id:??) landed as
https://crrev.com/1929f80a3a3ff0bfa8cdb97f2aa6f444071ba3e4
Cr-Commit-Position: refs/heads/master@{#41053}