[turbofan] Extend escape analysis to reduce certain CheckMaps.

[turbofan] Extend escape analysis to reduce certain CheckMaps.

Enable the experimental support in escape analysis to deal with
constant-foldable CheckMaps nodes and remove them from the effect
chain w/o blocking the scalar replacement of the object.

BUG=v8:4586, v8:5267
R=tebbi@chromium.org

Review-Url: https://codereview.chromium.org/2964473002
Cr-Commit-Position: refs/heads/master@{#46311}
Committed: https://chromium.googlesource.com/v8/v8/+/adf7f54e24c4b31207b4df0e30c28f7579b18f5c

[Benedikt Meurer, 2017-06-29 09:34:01]

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

[commit-bot: I haz the power, 2017-06-29 09:34:08]

Dry run: CQ is trying da patch.

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

[Tobias Tebbi, 2017-06-29 09:43:16]

On 2017/06/29 09:34:00, Benedikt Meurer wrote:

LGTM

[Benedikt Meurer, 2017-06-29 09:43:23]

The CQ bit was unchecked by bmeurer@chromium.org

[Benedikt Meurer, 2017-06-29 09:43:26]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2017-06-29 09:43:28]

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, 2017-06-29 10:18:21]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1498729406257880, "parent_rev":
"73ce185915963024dffc30cd69888d8425ebbc46", "commit_rev":
"adf7f54e24c4b31207b4df0e30c28f7579b18f5c"}

[commit-bot: I haz the power, 2017-06-29 10:18:27]

Description was changed from

==========
[turbofan] Extend escape analysis to reduce certain CheckMaps.

Enable the experimental support in escape analysis to deal with
constant-foldable CheckMaps nodes and remove them from the effect
chain w/o blocking the scalar replacement of the object.

BUG=v8:4586,v8:5267
R=tebbi@chromium.org
==========

to

==========
[turbofan] Extend escape analysis to reduce certain CheckMaps.

Enable the experimental support in escape analysis to deal with
constant-foldable CheckMaps nodes and remove them from the effect
chain w/o blocking the scalar replacement of the object.

BUG=v8:4586,v8:5267
R=tebbi@chromium.org

Review-Url: https://codereview.chromium.org/2964473002
Cr-Commit-Position: refs/heads/master@{#46311}
Committed:
https://chromium.googlesource.com/v8/v8/+/adf7f54e24c4b31207b4df0e30c28f7579b...
==========

[commit-bot: I haz the power, 2017-06-29 10:18:28]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/adf7f54e24c4b31207b4df0e30c28f7579b...

[Benedikt Meurer, 2017-07-03 07:13:20]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2970663002/ by bmeurer@chromium.org.

The reason for reverting is: Speculative revert for tiny fire on Canary
(crbug.com/738781).