[turbofan] Properly deal with out-of-bounds fields in EscapeAnalysis.

[turbofan] Properly deal with out-of-bounds fields in EscapeAnalysis.

Conflicting type feedback on Load/StoreICs can lead to out-of-bounds
field access, which is essentially dead code, but EscapeAnalysis was
confused about those. For now, mark the objects as escaping in these
cases, middle-term we want to deal better with this kind of compile-
time known dead code.

BUG=chromium:658185, v8:4586
R=jarin@chromium.org

Committed: https://crrev.com/7201bad99d16c0e4e9f33ebc14ddb80446b06a51
Cr-Commit-Position: refs/heads/master@{#40662}

[Benedikt Meurer, 2016-10-31 04:55:26]

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

[commit-bot: I haz the power, 2016-10-31 04:55:33]

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

[Benedikt Meurer, 2016-10-31 04:58:46]

Hey Jaro,

Here's the quickfix for escape analysis that we agreed on last week.
Please take a look.

Thanks,
Benedikt

[commit-bot: I haz the power, 2016-10-31 05:20:41]

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

[commit-bot: I haz the power, 2016-10-31 05:20:41]

Dry run: This issue passed the CQ dry run.

[Jarin, 2016-10-31 06:39:52]

lgtm

[Benedikt Meurer, 2016-10-31 06:41:24]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2016-10-31 06:41:28]

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, 2016-10-31 06:43:12]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-11-17 22:17:36]

Description was changed from

==========
[turbofan] Properly deal with out-of-bounds fields in EscapeAnalysis.

Conflicting type feedback on Load/StoreICs can lead to out-of-bounds
field access, which is essentially dead code, but EscapeAnalysis was
confused about those. For now, mark the objects as escaping in these
cases, middle-term we want to deal better with this kind of compile-
time known dead code.

BUG=chromium:658185,v8:4586
R=jarin@chromium.org
==========

to

==========
[turbofan] Properly deal with out-of-bounds fields in EscapeAnalysis.

Conflicting type feedback on Load/StoreICs can lead to out-of-bounds
field access, which is essentially dead code, but EscapeAnalysis was
confused about those. For now, mark the objects as escaping in these
cases, middle-term we want to deal better with this kind of compile-
time known dead code.

BUG=chromium:658185,v8:4586
R=jarin@chromium.org

Committed: https://crrev.com/7201bad99d16c0e4e9f33ebc14ddb80446b06a51
Cr-Commit-Position: refs/heads/master@{#40662}
==========

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

Patchset 1 (id:??) landed as
https://crrev.com/7201bad99d16c0e4e9f33ebc14ddb80446b06a51
Cr-Commit-Position: refs/heads/master@{#40662}